BTW, if you wanna put the youtube box like i did, just follow the instructions:
1. get your URL.
2.click on the little youtube box that you have in your tools
3.Paste it like it:[ YOUTUBE]TywmpMQYojs[/YOUTUBE] (the url was http://www.youtube.com/watch?v=TywmpMQYojs, just copy the final part.)
4.THERE U HAV IT.