I have taken those exact steps but when I paste it nothing shows up, that's with the link and the embed link
ummm... I just realized you were not able to upload your video to youtube. While you can't imbed an FB video, you should be able to post a link to it.
On FB pull up your video post and under options, select get link, then copy and paste the link into your forum post. As long as your privacy setting for the video is set to public, anyone clicking the link should be able to view the video.
Here's a link to one of my FB videos:
https://www.facebook.com/video.php?v=10203239738786198&l=4024988045576412578