Ok I think I figured out the avatar...
Click on your Ma2Griswold next to "welcome, ma2griswold" near the top of the page.
Click on the blue "customize profile" (under and to the right of where your picture will be)
Click on edit avatar (to the left of the page)
Click on choose file...add existing photo or take photo and then save changes.
The menu may be a little different for you since you are creating an avatar and I already have one. I hope this helps.