Click the link near the top of the page that says "User CP". This will load your a page that describes all of the details about your profile.
On that page look for a link that says "Edit Avatar" and follow the instructions to add your picture of Buttercup.
Let me know if you have any problems.
"I must say as to what I have seen of Texas it is the garden spot of the world. The best land and the best prospects for health I ever saw, and I do believe it is a fortune to any man to come here."
Davy Crockett, 1836