1. Get the URL of your video that you want to embed. Copy that URL.
2. Paste that URL to the text you type with on this forum.
3. Now that you have pasted the URL, you must remove the s in the https:// of the URL. If you do not, the forum will think that the hyperlink doesn't intend to become embedded, so it will stay a link, and not appear a video.
Here's an example how to do so:
Paste the URL: Now remove the 's': Bam, it's done! You'll get a little something like this if you are successful: