You can edit only one user at a time. The Edit button will be unavailable if no user account is select or if more than one user account is selected.
- Go to Account Profile > System Users.
- Select the user account you want to edit (click the check box next to the name).
- Click the Edit button to open the Edit System User dialog box.
- Edit the field(s) you want to change.
- Click Save.
For more information, please see: