When renaming users, you can only modify the user’s first, middle, and last name. You cannot modify the user ID. To rename a user, do the following:
In the Navigator pane, log into the server where the user object that you want to modify resides.
Expand the Administration folder, and then the Users folder.
Open the User editor for the user, and click the Details tab.
Make the necessary changes to the user’s name.
Click OK.