You can add embeded youtube video in interpals message or content. I will explain you step by step how to do it.

1. Select the url of the video. just copy past the address for example http://www.youtube.com/watch?v=WObWGpe1ff8&feature=related

2. Identify the youtube code. The youtube code is in red

http://www.youtube.com/watch?v=WObWGpe1ff8&feature=related

3. here select WObWGpe1ff8

4. Then put the code [youtube]WObWGpe1ff8[/youtube]

You have an option : click the youtube button

Then past the code like this

click OK and it is done