Okay that was hard to tell because your example turned into a white box.
Doing it this way you do not want the whole link. Just paste in the very last part
after the
"v=" in the youtube link. If the link has an & in it, skip that and anything following.
For example you would use the
bolded parts below, between your tags.
http://www.youtube.com/watch?v=nB6zg05CxYg
http://www.youtube.com/watch?v=Rt75y38J00s
http://www.youtube.com/watch?v=qFhM1XZsh6o&feature=related
and you end with something like.
[youtube]qFhM1XZsh6o[/youtube]