To show a video on your profile page, or on the BHUZ video page, copy the
"embed" code from youtube or a similar site. Do NOT copy the URL, you need the embed code. Paste it in to a box on your profile settings page.
BUT, to show a video in the
forum, put the URL in your post. Do NOT use the URL in the address bar at the top of the page. That URL includes the search for all related URLs that the youtube page shows, and you won't get the result you want.
Copy and Paste the URL code that is in the box to the immediate right of the video. You don't have to use the link icon to make it into a link - the page will do that for you automatically.