Set or open the keypad with the factory assigned passcode (located in the instruction manual), or your previously programmed passcode.
Press the red memory button on the side of the keypad (or on the back of the lock cover for a Brinks safe).
Wait for the keypad to beep twice and for the yellow indicator light to turn on.
Enter a new passcode into the keypad, using three to eight numbers.
Press the "B" key after you have input the passcode and wait for the system to beep twice to indicate successful programming.