The 'User Browser' screen will be displayed (see screenshot below), showing a list of users.
Locate the user and click the corresponding 'Edit' link. If the user doesn't initially appear on the screen, type part of their email address and/or select a group to which they belong, and click the 'Filter' button.
The 'Edit User' screen will be displayed. You can update the following fields:
'Display Name' — type the user's display-name. To change the user's login name, see Renaming a User.
'Email' — type the user's email address. This address is where the user will receive notifications.
'Auth Type' — select either 'Built-in' or the name of the appropriate external directory where the user will be stored. By changing the 'Auth Type', you are moving the user to a different directory.