Oh sorry! 

Just need to add a reference to the youtube page in docs/source/userguide/settings/plugins/index.rst. That's this page: http://www.thinkupapp.com/docs/userguide/settings/plugins/

Also the developer guide you wrote isn't linked anywhere in the docs. You can add a reference in docs/source/contribute/developers/plugins/index.rst http://www.thinkupapp.com/docs/contribute/developers/plugins/