Deleting Old Screen
Names
To delete a screen name
that you don't use anymore, open the AIM Sign On box

Now select the screen
name that you want to delete using the drop down box

Once you have the old
screen name selected, press the "Delete" button
on your keyboard. This will bring up a delete
confirmation dialog box

Click "Yes" to
delete the old screen name from your computer. Unfortunately,
this will not delete the screen name from the AIM server,
so it will still be registered under the email account you
created it with. This is not a problem unless you
are trying to create a new screen name and you get this
error:
"We're unable to
process your registration. You have already registered the
maximum number of screen names for your AOL Instant
Messenger account."
If you are getting that
message, you can create a new screen name using a
different email address. If you do not have a second
email address to register the new screen name under, you
can sign up for a free email account using Hotmail.
Once your hotmail account has been created, you can use
that new email address to create additional screen names.