Me alegra que te haya ayudado

Para agregarlo a más editores te doy aquí las plantillas ya modificadas

,
Ve a ,Plantillas y Estilos=>Plantillas=>Nueva Respuesta -Plantillas
y antes de pegar este código ,guarda una backpup de tu anterior plantilla
<html>
<head>
<title>{$lang->post_reply_to}</title>
{$headerinclude}
<script type="text/javascript" src="jscripts/post.js?ver=1400"></script>
{$tinymce}
</head>
<body>
{$header}
{$preview}
{$maximageserror}
{$attacherror}
{$reply_errors}
<form action="newreply.php?tid={$tid}&processed=1" method="post" enctype="multipart/form-data" name="input">
<input type="hidden" name="my_post_key" value="{$mybb->post_code}" />
<table border="0" cellspacing="{$theme['borderwidth']}" cellpadding="{$theme['tablespace']}" class="tborder">
<tr>
<td class="thead" colspan="2"><strong>{$lang->post_new_reply}</strong></td>
</tr>
<tr>
<td class="tcat" colspan="2"><span class="smalltext"><strong>{$lang->reply_to}</strong></span></td>
</tr>
{$loginbox}
<tr>
<td class="trow2" width="20%"><strong>{$lang->post_subject}</strong></td>
<td class="trow2"><input type="text" class="textbox" name="subject" size="40" maxlength="85" value="{$subject}" tabindex="1" /></td>
</tr>
{$posticons}
<tr>
<td class="trow2" valign="top"><strong>{$lang->your_message}</strong><br />{$smilieinserter}</td>
<td class="trow2">
<textarea id="message" name="message" rows="20" cols="100" tabindex="2" >{$message}</textarea>
{$codebuttons}
{$multiquote_external}
</td>
</tr>
<tr>
<td class="trow1" valign="top"><strong>{$lang->post_options}</strong></td>
<td class="trow1"><span class="smalltext">
<label><input type="checkbox" class="checkbox" name="postoptions[signature]" value="1" tabindex="6"{$postoptionschecked['signature']} /> {$lang->options_sig}</label>
{$disablesmilies}
</span></td>
</tr>
{$modoptions}
{$subscriptionmethod}
{$captcha}
</table>
{$attachbox}
<br />
<div align="center"><input type="submit" class="button" name="submit" value="{$lang->post_reply}" tabindex="3" accesskey="s" /> <input type="submit" class="button" name="previewpost" value="{$lang->preview_post}" tabindex="4" />{$savedraftbutton}</div>
<input type="hidden" name="action" value="do_newreply" />
<input type="hidden" name="replyto" value="{$replyto}" />
<input type="hidden" name="posthash" value="{$posthash}" />
<input type="hidden" name="attachmentaid" value="" />
<input type="hidden" name="attachmentact" value="" />
<input type="hidden" name="quoted_ids" value="{$quoted_ids}" />
<input type="hidden" name="tid" value="{$tid}" />
{$editdraftpid}
</form>
{$forumrules}
{$threadreview}
{$footer}
</body>
</html>
Luego vas a los mismo de antes ,y selecionas Mensajería privada-Plantillas
y pegas este código
<html>
<head>
<title>{$lang->compose_pm}</title>
{$headerinclude}
<script type="text/javascript" src="jscripts/usercp.js?ver=1600"></script>
{$tinymce}</head>
<body>
{$header}
<form action="private.php" method="post" name="input">
<input type="hidden" name="my_post_key" value="{$mybb->post_code}" />
<table width="100%" border="0" align="center">
<tr>
{$usercpnav}
<td valign="top">
{$preview}
{$send_errors}
<table border="0" cellspacing="{$theme['borderwidth']}" cellpadding="{$theme['tablespace']}" class="tborder">
<tr>
<td class="thead" colspan="2"><strong>{$lang->compose_pm}</strong></td>
</tr>
<tr>
<td class="trow1" valign="top" width="200"><strong>{$lang->compose_to}</strong>
<script type="text/javascript">
<!--
document.write('(<a href="#" onclick="showBcc(); return false;" title="{$lang->compose_bcc_show_title}">{$lang->compose_bcc_show}<\/a>)');
// -->
</script>
<br /><span class="smalltext">{$lang->separate_names}{$buddy_select_to}</span></td>
<td class="trow1" valign="top"><textarea name="to" id="to" rows="2" cols="38" tabindex="1">{$to}</textarea>{$max_recipients}</td>
</tr>
<tr id="bcc_area">
<td class="trow2" valign="top"><strong>{$lang->compose_bcc}</strong>{$buddy_select_bcc}</td>
<td class="trow2"><textarea name="bcc" id="bcc" rows="2" cols="38" tabindex="1">{$bcc}</textarea></td>
</tr>
<tr>
<td class="trow1"><strong>{$lang->compose_subject}</strong></td>
<td class="trow1"><input type="text" class="textbox" name="subject" size="40" maxlength="85" value="{$subject}" tabindex="3" /></td>
</tr>
{$posticons}
<tr>
<td class="trow2" valign="top"><strong>{$lang->compose_message}</strong>{$smilieinserter}</td>
<td class="trow2">
<textarea name="message" id="message" rows="20" cols="70" tabindex="4">{$message}</textarea>
{$codebuttons}
</td>
</tr>
<tr>
<td class="trow1" valign="top"><strong>{$lang->compose_options}</strong></td>
<td class="trow1"><span class="smalltext">
<label><input type="checkbox" class="checkbox" name="options[signature]" value="1" tabindex="5" {$optionschecked['signature']} />{$lang->options_sig}</label><br />
<label><input type="checkbox" class="checkbox" name="options[disablesmilies]" value="1" tabindex="6" {$optionschecked['disablesmilies']} />{$lang->options_disable_smilies}</label><br />
<label><input type="checkbox" class="checkbox" name="options[savecopy]" value="1" tabindex="7" {$optionschecked['savecopy']} />{$lang->options_save_copy}</label><br />
<label><input type="checkbox" class="checkbox" name="options[readreceipt]" value="1" tabindex="8" {$optionschecked['readreceipt']} />{$lang->options_read_receipt}</label><br />
</span></td>
</tr>
</table>
<br />
<input type="hidden" name="action" value="do_send" />
<input type="hidden" name="pmid" value="{$pmid}" />
<input type="hidden" name="do" value="{$do}" />
<div style="text-align: center;">
<input type="submit" class="button" name="submit" value="{$lang->send_message}" tabindex="9" accesskey="s" />
<input type="submit" class="button" name="saveasdraft" value="{$lang->save_draft}" tabindex="10" />
<input type="submit" class="button" name="preview" value="{$lang->preview}" tabindex="11" />
</div>
</td>
</tr>
</table>
</form>
{$footer}
<script type="text/javascript">
<!--
if($('bcc_area') && $('bcc').value == "")
{
$('bcc_area').style.display = 'none';
}
function showBcc()
{
if($('bcc_area').style.display == 'none')
{
$('bcc_area').style.display = '';
}
else
{
$('bcc_area').style.display = 'none';
}
}
// -->
</script>
{$autocompletejs}
</body>
</html>
Editar-plantillas ,y selecionas "Editpost"
y pegas este code
<html>
<head>
<title>{$mybb->settings['bbname']} - {$lang->edit_post}</title>
{$headerinclude}
<script type="text/javascript" src="jscripts/post.js?ver=1400"></script>
{$tinymce}</head>
<body>
{$header}
{$preview}
{$post_errors}
{$attacherror}
<form action="editpost.php" method="post" name="editpost">
<input type="hidden" name="my_post_key" value="{$mybb->post_code}" />
<table border="0" cellspacing="{$theme['borderwidth']}" cellpadding="{$theme['tablespace']}" class="tborder">
<tr>
<td class="thead" colspan="3"><strong>{$lang->delete_post}</strong></td>
</tr>
<tr>
<td class="trow1" style="white-space: nowrap"><input type="checkbox" class="checkbox" name="delete" value="1" tabindex="9" /> <strong>{$lang->delete_q}</strong></td>
<td class="trow1" width="100%">{$lang->delete_1}<br /><span class="smalltext">{$lang->delete_2}</span></td>
<td class="trow1"><input type="submit" class="button" name="submit" value="{$lang->delete_now}" tabindex="10" /></td>
</tr>
</table>
<input type="hidden" name="action" value="deletepost" />
<input type="hidden" name="pid" value="{$pid}" />
</form>
<br />
<form action="editpost.php?pid={$pid}&processed=1" method="post" enctype="multipart/form-data" name="input">
<input type="hidden" name="my_post_key" value="{$mybb->post_code}" />
<table border="0" cellspacing="{$theme['borderwidth']}" cellpadding="{$theme['tablespace']}" class="tborder">
<tr>
<td class="thead" colspan="2"><strong>{$lang->edit_post}</strong></td>
</tr>
{$loginbox}
<tr>
<td class="trow2"><strong>{$lang->subject}</strong></td>
<td class="trow2">{$prefixselect}<input type="text" class="textbox" name="subject" size="40" maxlength="85" value="{$subject}" tabindex="1" /></td>
</tr>
{$posticons}
<tr>
<td class="trow2" valign="top"><strong>{$lang->your_message}:</strong><br /><div style="text-align: center;">{$smilieinserter}</div></td>
<td class="trow2">
<textarea name="message" id="message" rows="20" cols="100" tabindex="3">{$message}</textarea>
{$codebuttons}
</td>
</tr>
<tr>
<td class="trow1" valign="top"><strong>{$lang->post_options}</strong></td>
<td class="trow1"><span class="smalltext">
<label><input type="checkbox" class="checkbox" name="postoptions[signature]" value="1" tabindex="6"{$postoptionschecked['signature']} /> {$lang->options_sig}</label>
{$disablesmilies}</span>
</td>
</tr>
{$subscriptionmethod}
{$pollbox}
</table>
{$attachbox}
<br />
<div align="center"><input type="submit" class="button" name="submit" value="{$lang->update_post}" tabindex="3" accesskey="s" /> <input type="submit" class="button" name="previewpost" value="{$lang->preview_post}" tabindex="4" /></div>
<input type="hidden" name="action" value="do_editpost" />
<input type="hidden" name="posthash" value="{$posthash}" />
<input type="hidden" name="attachmentaid" value="" />
<input type="hidden" name="attachmentact" value="" />
</form>
{$footer}
</body>
</html>
y creo que ya no hay más xd y perdona pero la de Quick Reply no encuentro la plantilla

espero que te valga!

y recuerda
Antes de hacer ,lo que te he dicho ,guarda una backpup de tus plantillas