I just did this so I'm refreshed on the "how to". You will need to upload the vid to a hosting site (Youtube, photobucket, tinypic etc) You can then either post the direct link to the video so members can view it on the hosting site. Otherwise you can embedd it into your post on the forum.

To do this you save the embedding code or html link. Then click on "Source" at the top left side of the BinkyBunny Post editor. If you have already typed text, once you click Source, the test will show as a bunch of jargon. Don't worry! Put cursor at the end of the jargon and paste the video link. More jargon! You can then Submit the post. Or click on Source again to revert back to normal text. Either way, the submitted version should be jargon free. Hope this made sense.