Go to the Sports Section (to take you to SportsAnswerBank), click on *Rtaxron Profile* in the top right hand corner. Choose on of the default avatars or upload your own image - note the size restriction though...
However, no avatars can be seen by other users except when in the SportsAnswerBank...
Or - do you mean change your *username* (Rtaxron) ? You would have to email the editor of AnswerBank for that - it's probably easier just to start again with a new username.