Thanks! I'm still editing the text, I'm putting it on the banner itself.
But the black box you're talking about isn't actually my background, it's part of Cosmic Panda for some reason...
Edit: Never mind, I thought I was doing minor changes, turns out it hasn't been showing me the one I was telling it to, it just showed the one I had.... so I've been editing the same thing for half an hour because youtube won't take the actual new background... I'll get it to work though..