Knowledgebase editor add viedo from third party

hi.
thank for great plugin.
i migrate from dokan pro to wcfm.

I can’t access to source code of content in Knowledgebase editor. wordpress editor in admin area have visual section and another tab for text that contain html source code of contents.

i need this for adding video from third party site names Aparat, this site give me a script for embed video in my content. but i can’t add this code to my Knowledgebase content.

thank u.