How to embed HTML (or a hosted video)
When editing an article you can follow these instructions add HTML to an article. Use this technique to embed videos hosted on video services into your articles.
Click on the + icon
Click Embed HTML
If your YouTube video is marked as "Private," you can't get the embed code. But if it's marked as "Unlisted" (or something along those lines) or "Public," then you can get the embed code.