We are sorry, it is not possible to have your account name changed. When you first create your account, you do have to choose a unique account name that is not already taken, so changing it is not an option.
If you would like to change your character name, you need to visit the AdventureQuest Forums and look for information on how to change your character's name. You must find the Nowhere Quest. It's accessible only after dying and looking carefully at the screen. (Hint: Click on the hourglass. After that, explore the area.)