[Canister]

To post a video take a youtube link such as:
http://www.youtube.com/watch?v=aalvRjrr ... grec_index

Then hit the media button (It looks like a film role):

After you press the button insert the link and press ok.

Should look like this after
[video=youtube]http://youtube.com/watch?v=aalvRjrr0Wg[/video]