In the interest of not being an dick and someone had to tell me and you're only here since Sept 2015.
You cannot attach the shortened URL from You Tube, I also think you have to pull it from the playlist so it's a single video.
This leaves: https://www.youtube.com/watch?v=jDxbeJVOYK0
Add a new comment and in the upper right corner there will be a gray box that says Attach.. It's only there for the opening comment, not for replies. Your options are attach [nothing, a picture, a YouTube video]. For the picture, it has to be the Picture ID number from Wikifeet, nothing else. I already outlined the restrictions on You Tube. Try again and maybe someone with more privileges (and that's a mystery all on its own) might be able to remove this set of comments.
Damn, this site needs a decent FAQ.