The question has been closed for the following reason "Duplicate Question" by TheTechDude Feb 22 '11 at 20:42
Go to your profile and click the right hand options to edit your profile. Below your picture is a link for Gravatar, click it. This will take you to a website where you can register your account. Once registered, upload the picture you want, crop it, and accept it. Choose that as the picture you want and it will load itself in about 24 hours to your lockergnome account.
answered Feb 22 '11 at 20:42