To add a youtube video first go on youtube.com then look up a video once your on the video under the discription there should be something that says "embed". copy that code then go to your forums an then admin>add catigory>add board>past code in the board.
ok name your catigory youtube an board youtube or something like that an post the embed code in the DISCRIPTION OF THE BOARD.

or just go into a board already made new topic then post embed code!!

hope this guide helps for who wanted videos on there forums!!

~monsta