I don't get how to use pictures for your background...

I like my profile right now, but it's not perfect yet. I just went with a color scheme that jumped into my head. I probably won't keep it like this for very long. I like pink, but I have the feeling that this will feel way too bright after a while.

Ferra,
Ooh! Thank you very muchly. x3

I messed around with it and I think I did ok upgradeing my profile