To delete an AOL screen name (now called username), go to My Account and sign in with your master username. Next you will have to answer your Account Security Question and then click on continue. Under Username Options, click Manage My Usernames. Under Additional Usernames click the X next to the username that you wish to delete. You can find more information here: http://help.aol.com/help/microsites/search.do?cmd=displayKC&docType=kc&externalId=217428.