1. Press the Down arrow 4 times until the display shows "System Programming".
2. Press OK / Enter.
3. Enter the 4-digit master code and press OK.
4. The screen should display "Access Codes". Press OK / Enter again.
5. Use Up/Down arrows to select the user you want to edit.
6. Press OK / Enter.
7. Enter a new 4-digit code for this user.
8. Press OK / Enter.
9. Press Status until the time (Home screen) is displayed.
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