Start with "youtube" (no quotations) in-between brackets (these guys [ ] )
Put the youtube video's web address (not embedding address given at the bottom or mobile address or any yout.ube type shortened addresses) in between
Then end with a [/youtube].
The problem in that video's case was the address was in "https://" form rather than just "http://"...for some reason the "secure" version of the address resulted in just a white screen when trying to post it here (though that's not the only reason one might end up with just a white screen, though)