BIG thanks to ry@n (this can also be found in the OT section)
In order to post the video, you must use the unique identifer that every video on YouTube has.
For example: http://www.youtube.com/watch?v=xd25yKG7nLk
The code 11 digit code at the end of the URL will be what you use in the brackets,
[ youtube ] 11 code here [ /youtube ]