Changing a user's username
Sometimes it's necessary to change a User's username. Perhaps you wish to change your naming convention, or you have two users with similar names. Managing Users in this way is an Administrator-only function. Logged in as an Administrator, click on the Administrator menu and select the Users sub-menu.
Select the User you wish to change. From the "Edit" menu select "Change username".
Enter the new username (Usernames must be unique).
Save your changes. Don't forget to let the User know their new username! Their password remains unaffected by this change.