**EDITED to add updated instructions** With a newer version of vBulletin the Youtube button no longer exists. You simply have to post the link and it will automatically display the video.
Someone asked that I post this less technical set of instructions here in this thread, so I am doing this for anyone that had a problem with Boom's more technical instructions.
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To Post YouTube Video on AFF:
First, hit the post reply button to open a posting window.
Then click on the YouTube button. A small window will come up. You type in the text that you want to show just above the video (such as the song title).
Then hit OK. It will post some code in your window, and your cursor will be flashing in a certain spot. You will copy and paste ONLY what is behind the equal sign that is shown in the YouTube URL into that spot.
Then hit Preview post. It should take a minute or so to load, but it will show you if you have correctly done it, because you will see the video with a play arrow in the center of it.
If you see the video-- you can hit submit post. If not, something isn't right.