It is easy to post YouTube videos here. The trick is to use the long link in YouTube. Easier to do than explain, but here it is in detail.

Click the "share" button under the video on YouTube.



Click on the "Options" check box



Select "Long Link"



Copy the code from the text box



In the XPT reply screen, select video embed icon and click YouTube video



Paste the code from YouTube into the box




It should look like this