Hi and welcome to Pet Talk, i hope you enjoy your time here.

At the top of the page you will see a "User cp" button (It is the second one from the left), click on that and then you will see
" User Control Panel For GoldenRetrieverLover_01" just under that there is a "Edit options" button click that, right down at the bottom of that page you should see "Other options" and "Avatar" click on the Avatar buton and you should be right from there.

If you have any other questions feel free to ask, and once again welcome.