I don't remember how to change my background :(

So I've been away for a while and obviously some things have changed. My profile code was narly af but I managed to fix most of it. Except I don't remember how to change my background to a gif or an image anymore. The best I got it was when I inspected the page I could still change it but when I copied and pasted it to edit my profile it didn't work. Also, I think my music broke again oof. Idk when I'll be able to fix it bc I literally don't remember how to code. I never really learned how to do that I just watched like a Spacehey tutorial. Anyway this will have to do for now.

Btw I'm not usually on Spacehey much but sometimes I get the itch to come on here so if I disappear on you guys I'm probably fine. Probably.