Hey all,
While a link is fine, I think it's snazzier to post the actual video in your post. Like this:
Here's how to do it.
1. Upload a video to Youtube. Sure, you might be able to make this work for other video sites, I haven't tried yet. Make sure the video's privacy setting is "public."
2. Below your posted video are three tabs, "Share This Video, Embed, and Email." Choose "Share this video."
3. Below the "Share This Video" is a box containing an http address, copy that whole address.
4. Paste that address within your post.
5. Click preview and make sure nothing's gone pear shaped.
6. If everything looks as it should, click post.
Please let me know if this doesn't work for you.