User blog:Zombiehunter115/Do I even wiki?

Ok, so I tried to make an edit on here and then it got removed because it wasn't sourced properly. It's kind of sad to think I've been on this wiki since 2011 and I still don't know how to edit and sourse properly. How do I sourse something? For example, the thing I edited. I guess I'm the only one who knows who did the David Bowie cover in the Infinite Warfare trailer. I listed it as Lady Heroine because that's who did it. I found a sourse, I just don't know what to do with it. Any help would be appreciated.