This is how I did it:
- click your 'private messages' link on your top right corner of the display
- on the left hand menu, click 'edit avatar'
- then on that page you will have the opportunity to upload your intended avatar.
This worked for me, albeit, there may be another way, but give it a try.
Best of luck.
It is enough for evil to flourish when good people do nothing
when your logged on just got to (user CP) and then edit avatar. the image has to be a certain size so just use something like paint to edit the size