Changing My Profile Header?

Hi folks!

I realize this may be a silly question, but I can't for the life of me remember how I changed my profile header.

I'd like to change the background as it's due for an update, but I have no idea how I did it last time... Was this feature removed? Am I missing something?

I honestly have no idea where this feature went. On most sites (like Artstation) you just click a "change background" button and that's it! But I can't seem to find anything like that anywhere in my settings or profile on CGTrader.

Hopefully one of the many amazing people on this website could inform me what I'm missing. Maybe I should get my eyes checked, hah!