Looking at what you’ve posted, I don’t think it’s the URL that you’ve copied, as it’s just a link to the youtube HTML5 video player. What kind of device and what browser are you using?
I can’t believe I’m doing this - trying to help you get a Yes song posted on here, in spite of the fact that I’d sooner boil my own head than listen to a song by Yes. 
OK SoG. Try this…
First find the video you are after on YouTube (Something by Decemberists should do), and find the Share/Sharing button…
Then copy the sharing URL that they present you with.
Then simply paste that URL into the editor. No need to create a link to the video. Infact, if you create a link it will cause the forum display to corrupt (it’s on His papship’s to do list).
And this is the result
Mate at work just shared a playlist with me, featuring this. Usually not a fan of Bowie covers*, but this one is pretty darn decent.
*Yes, I do like Man Who Sold the World. Kurt was a god.
I think most will have heard this but still worthy of inclusion here just in case it escaped you…
You know that cover of “Somewhere” by Tom Waits horrifies some non-musical types, like my sister-in-law. She’s the type who rarely buys or listens to music but claims to love Opera and Classical Music but in fact couldn’t name you anything but Nessum Dorma and a couple of tunes from Les Miserables.
I played that version by Tom Waits and of course she was mortally offended by it. It’s a fucking brilliant rendition, a heartfelt, moving version that will be realised as such but the true music lover…
Let’s here it again. 
I rather enjoyed that, Balti Stench. Obviously it would have to go a very long way to match the original by Little Marti and his Wet Boys*, but it wasn’t bad at all.
* Fear not, I do know that it’s originally by Reg and the boys - Swindon’s finest.
ttps://www.youtube.com/watch?v=zX8piT5lOsM
Time for another bump. Here’s Frank and his boys (notably Jean-Luc Ponty), reinterpreting Little Richard
Ryan Adams does Tay Tay, it actually really works. Been listening to and enjoying the whole album
From the world’s greatest Disco Diva…MacArthur Park all 17minutes 52 seconds of it…
Maybe a bit controversial because the original so good, but quite like this cover of Bob Mould’s Classic - Black Sheets of Rain
Lorde! <3