[S.Brothers]

This is a technique that works IF YOU ARE A SITE SUPPORTER:

OK...

• On the youtube page, click the "share" button under the video.
• when that opens... click "embed"
• copy the code that drops down.
• Paste that code here in the compose window where you type your post (the full editor page NOT quick reply)
• Scroll down a little to where you see the "options" and "click to configure posts"
• When that drops down, click the HTML drop down and choose "HTML ON Auto line break mode"
• Click "add reply" at bottom

Congrats... you posted a video!

p.s. This only works for site supporters in most forums.