What did your  edit the functions "function topic_form($forumid)" and  "function reply_form($args)" on plugin file class-template.php. Let me Know... I'm also facing same issues

hi @rajraj if you have the latest version of WPforo, just add the following filter to your functions.php (in your theme). No need to edit files in the plugin folder. Realize that you can remove and add buttons, and even TinyMCE plugins

//filter MCE buttons for WPFORO

add_filter( 'wpforo_editor_settings', 'editarbotoes_wpforoeditor');
function editarbotoes_wpforoeditor( $buttons ) {

$buttons['tinymce']['toolbar1'] = 'bold,italic,underline,strikethrough,forecolor,bullist,numlist,hr,alignleft,aligncenter,alignright,link,unlink,blockquote,emoticons,image,media';

$buttons['tinymce']['plugins'] = 'hr,lists,media,textcolor,wpemoji,wplink,image';

return $buttons;
}