you need to use the [youtube] code, like this:
where xxxxxx is the code at the end of the video link, like this:Code:[*youtube]xxxxxxxxxx[/youtube*]
http://youtube.com/watch?v=xxxxxxxxxxx
the code inside the parenthesis, or everything from the equal sign until the end assuming it doesn't have "&feature=related" at the end.
looks like this when you're done:
notes:
do NOT use Youtube's pre-generated HTML embed code. it will not work!
Make sure the only thing inside youtube code brackets is the video code!