On the home page, on the upper right hand side under your name, there is a link to update your profile. If you click on that link (or just click on your name), it will take you to your profile. The last block on the page is your Avatar control panel. You can choose from the ones available, or you can upload your own.
Freedom is the sure possession of those alone who have the courage to defend it. -Pericles
Let every nation know, whether it wishes us well or ill, that we shall pay any price, bear any burden, meet any hardship, support any friend, oppose any foe to assure the survival and the success of Liberty -JFK