Q-See QSD2216 - Manual (Page 16)

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5.2.4 Change Password
When the cursor moves to CHANGE PASSWORD, please press the enter button, and the
Change Password window will appear.
Password Level: password type of the DVR, the DVR has various types of password:
SETUP: If set to “YES”, you have to input password to enter menu.
SYSTEM: If set to “YES”, you have to input password to boot the DVR.
ALWAYS: If set to “YES”, you have to input password to all operation.
If you select the Password Change and press the Enter button, the Password change
window will display as below:
Please enter the current password, then input new password and confirm the password.