Here's how you can do more than just paste a link to a video.
Here's how you can make the youtube video APPEAR and be able to PLAY in your post:
1. Go to Youtube.com and find your video.
2. Click SHARE on the youtube menu options. It's that < looking icon.
3. Then Click EMBED (located below the video)
4. COPY the 'iframe' text in the box.
5. Now click the VIDEO icon in your posting window.
6. Select "iframe".
7. Select "SOURCE" and PASTE your youtube iframe code into the box.
8. Save your work! and VOILA! You have shared a youtube in your post.
Please be careful what you share.