Code is pretty simple. For our purposes here ab=yt (so that I don't create a real youtube window):
[ab=any title you want to have above the youtube box]the youtube video code(comes after the v= in the address window of the youtube video)[/ab]
So, for this video:
http://www.youtube.com/watch?v=5GFC5892OTs
Let's title it "Hasheem Thabeet Mix"
And the youtube code is: 5GFC5892OTs (you can see it there at the end of the address)
so to embed it here it would be:
[ab=Hasheem Thabeet Mix]5GFC5892OTs[/ab]
again where ab should be replaced by yt.