I found a code that allows videos other than just YouTube videos to be posted. Everyone pretty much knows how to use the YouTube tags, I think.
So to post videos from other places, if the video you're watching elsewhere offers an embed code, and most do, it's pretty simple. Sometimes it just says embed, and sometimes you'll have to right click the video to get the embed code. Anyway, to the far right of the YouTube button is a drop down box that says videos. If you click that, the first option will be the "embed code" which operates just like the Youtube one. Click it and it will add the tag to your message. Paste the embed code in the middle of it and that's it. Would have been nice to know this code was around 2 years ago, lol...but better late than never.