To create an embedded YouTube video link:
You can use a BB tag like this:
So if the YouTube Video is located at:
Take the code behind the = sign and dump it between the YouTube brackets where the XXXXXXX's are:
and then it will be embedded.
If you are using the message posting editor, just click the YouTube icon and it will put the YouTube tags in your post and you just paste in the video code.
That's all there is to it. Let's get them videos!