You can embed You Tube videos here using the following code:
<youtube> width=420 height=340 source=the url of the you tube page you want to embed </youtube>
For example, typing in:
<youtube> width=420 height=340 source=http://www.youtube.com/v/-6hKTsBKB9w </youtube>
will give you:
EmbedVideo received the bad id "width=420
height=340
source=http://www.youtube.com/v/-6hKTsBKB9w" for the service "youtube".
Feel free to switch the width and height to change the size of the video.