Steps:
1] copy files tiny_mce to /3rdParty folder (if you chose to get files from the tinyMCE main site then please copy only the folder tiny_mce under /tinymce/jscripts/ to 3rdParty in Pligg base) or download this topic.
2] Enable HTML in submit from admin panel to include the following tags

Code:

<br><font><img><p><a><strong><ul><li><ol><u><em><span><pre><h1><h2><h3><hr><embed>

3] Edit Pligg.tpl to have the following lines after the

Code:

{checkForJs}

Code:

{if $pagename eq "submit" or "editlink"} <script language="javascript" type="text/javascript" src="{$my_pligg_base}/3rdparty/tiny_mce/tiny_mce.js"></script> {/if}

4] Edit submit_step_2.tpl to have the following lines after

Code:

{config_load file="/libs/lang.conf"}

add

Code:

{literal} <script language="javascript" type="text/javascript"> tinyMCE.init({ mode : "exact", elements : "bodytext,summarytext", theme : "advanced", plugins : "advimage,advlink,emotions,iespell,insertdatetime,preview,media,visualchars,xhtmlxtras", theme_advanced_buttons1 : "bold,italic,underline,|,justifyleft,justifycenter,justifyright,justifyfull,|,bullist,numlist,|,insertdate,inserttime,|,forecolor,backcolor,|,hr,removeformat,formatselect", theme_advanced_buttons2 : "link,unlink,image,media,|,undo,redo,cleanup,|,code,preview", theme_advanced_buttons3 : "", theme_advanced_toolbar_location : "top", theme_advanced_toolbar_align : "left", theme_advanced_path_location : "bottom", extended_valid_elements : "a[name|href|target|title|onclick],img[class|src|border=0|alt|title|hspace|vspace|width|height|align|onmouseover|onmouseout|name],hr[class|width|size|noshade],font[face|size|color|style],span[class|align|style]", browsers : "msie,gecko,opera,safari" }); </script> {/literal}

5] Edit editlink_edit_center.tpl to have the following lines after

Code:

{config_load file="/libs/lang.conf"}

add

Code:

{literal} <script language="javascript" type="text/javascript"> tinyMCE.init({ mode : "exact", elements : "bodytext,summarytext", theme : "advanced", plugins : "advimage,advlink,emotions,iespell,insertdatetime,preview,media,visualchars,xhtmlxtras", theme_advanced_buttons1 : "bold,italic,underline,|,justifyleft,justifycenter,justifyright,justifyfull,|,bullist,numlist,|,insertdate,inserttime,|,forecolor,backcolor,|,hr,removeformat,formatselect", theme_advanced_buttons2 : "link,unlink,image,media,|,undo,redo,cleanup,|,code,preview", theme_advanced_buttons3 : "", theme_advanced_toolbar_location : "top", theme_advanced_toolbar_align : "left", theme_advanced_path_location : "bottom", extended_valid_elements : "a[name|href|target|title|onclick],img[class|src|border=0|alt|title|hspace|vspace|width|height|align|onmouseover|onmouseout|name],hr[class|width|size|noshade],font[face|size|color|style],span[class|align|style]", browsers : "msie,gecko,opera,safari" }); </script> {/literal}

FROM: http://www.pliggtemplates.eu/index.php?Itemid=43&catid=5&func=view&id=25&option=com_fireboard