I don't know how to change my Profile Picture

I need some helps I cannot find where I change my profile picture can someone help me. I read someones responds to another persons some persons questions but I can not find what he said what my says is Learner home, Settings, Help, and Log out. When I went to Settings it didn't show where I change my profile picture and I went to Learner home and it didn't either. I am new to Khan Academy a week ago so I am still trying to figure out some stuff.

Bella Grusing ,