It says to paste the bb code; I can't find that on Youtube yet, but looking at one of the videos that works, I see this (I added the dot before "video"):
[.video=SAVE THE DAY Response]9648[/video]
But perhaps the forum's supposed to make that from the URL after you press "Load Information", which doesn't seem to be working for me.
Actually, the more I think about it, of course that's what it is. Never mind.