Open ‘/class/xoopsform/formdhtmltextarea.php‘, Position to line 67 , var $htmlEditor = array(); Change it to tinymce editor, var $htmlEditor = array(‘XoopsFormTinymce’, ‘/class/xoopseditor/tinymce/formtinymce.php’); XOOPS Version: 2.4.5 RC3 PHP Version: 5.2.13