Hi again Carmen. If you are talking about your avatar or the picture under your name it needs to be done under "my profile" there are lots of things you can add there. Where it says my avatar, upload your photo there it has to be sized down pretty small, like 400 x400 I think.
Is that what you are asking? Welcome by the way, it's good to have you here.
Be who you are and say what you feel because those who mind don't matter and those who matter don't mind-Dr. Suess