Below is a YouTube embedded video.
Here's how you do it:
Go to the video you want on YouTube. Look at the URL. In my case, the full URL was:
http://www.youtube.com/watch?v=-sOd0Bzjqho
In this case, you want everything after the = sign (bolded here).
Place that between "[youtube]" and "[/youtube]" and it'll embed on the page.
