to embed a youtube video you are going to use the following code:
[youtube] ***** [/youtube]
now wat goes in the ***** area is going to be as follows:
lets say i want to embed the youtube video at this url http://www.youtube.com/watch?v=cpP7b2lUxVE (just a random family guy clip)
you are going to use everything that comes AFTER the "="
so in this example i would substitute "cpP7b2lUxVE" for the ***** and thus giving me the code:
[youtube]cpP7b2lUxVE[/youtube]
which turns out like this:
[youtube]cpP7b2lUxVE[/youtube]
i tried to explain that the best i could...if you still have questions just ask or PM me or somthing
EDIT: looks like knypt just answered while i was writing so now you have 2 answers...good luck