To post YouTube videos:
1) Find a great YouTube video
2) In New Topic or Reply compose window, click on YouTube, located above. (I don't have YouTube icon for it right now, but will later. I cannot find a small one.)
3) The YouTube code will be inserted in the body of the compose window.
4) Then, insert/paste the URL of the video between the tags. The URL is located to the right of the video, on YouTube.com. Just click, copy & paste.
4) Click PREVIEW to make sure your video is posted correctly.
If you have trouble -- PM me.

This is what your code will look like, minus the code box & the spaces. It's easy! Have fun!
[youtube] http://www.youtube.com/watch?v=fd6LRFepDlY&feature=related [/youtube]