Powinieneś mieć gdzieś na stronie gdzie jest wysiwyg takie coś:
<script type="text/javascript">
tinyMCE.init({
mode : "textareas",
theme : "advanced",
plugins : "emotions,spellchecker,advhr,insertdatetime,preview",
// Theme options - button# indicated the row# only
theme_advanced_buttons1 : "newdocument,|,bold,italic,underline,|,justifyleft,justifycenter,justifyrigh
t,fontselect,fontsizeselect,formatselect",
theme_advanced_buttons2 : "cut,copy,paste,|,bullist,numlist,|,outdent,indent,|,undo,redo,|,link,unlink
,anchor,image,|,code,preview,|,forecolor,backcolor",
theme_advanced_buttons3 : "insertdate,inserttime,|,spellchecker,advhr,,removeformat,|,sub,sup,|,charma
p,emotions",
theme_advanced_toolbar_location : "top",
theme_advanced_toolbar_align : "left",
theme_advanced_statusbar_location : "bottom",
theme_advanced_resizing : true
});
</script>
po prostu dodajesz kolejne właściwośći (nowe linijki do konfiguracji)