User blog comment:AnimationFan15/Fanfiction - Hearts of Gold/@comment-5888829-20161217005456/@comment-24364245-20161217010150

Use this code.

{ {MPC|width=0|height=0|id=(YouTube Link)|autoplay=1} }

For the YouTube link, you add in that jumble of letters after the equal sign, like this:

https://www.youtube.com/watch?v=F82W3tKtr8c