However, when I tried using the image you had in the Username codes page it was too big. I reccomend using a favicon sized image which is what I used here. Try using https://favicon.io/favicon-converter/ to get an image that size.
Hope this helps!
Hmm...I can't find where what you're requesting can be done. If you've seen this on a wiki before and can link it, I'll probably figure it out. Otherwise, I'll need to consult with people of more coding knowledge than me.