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Did you figure out the changes yet? If not, the picture change is easy. The name change, if even possible, would have to be done through one of the administrators.
Picture (Avatar) change: hover your pointer on your name in the upper right hand (your right hand) corner. One of the choices that pops up is "change my avatar." Then you can browse away on your computer and choose the pic you want.
You an also go into "my profile" and look just under your avatar. It says "replace my avatar" and you can do the same thing there.