QNAP Security VioStor NVR (Version: 3.5.1) - Manual (Page 180)

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6.5.2 Edit User
Select a user on the list and click ‘Edit’. Change the password; assign the rights of system
administration and camera access to the user. However, the user name cannot be
changed.
6.5.3 Delete User
To delete a user, select the user on the list and click ‘Delete’. Click ‘OK’ to confirm.
Note: The system administrator (admin, supervisor, sysmgr) cannot be deleted.