Remove the battery cover on the back of the clock with the screwdriver and install one AA battery.
Set the correct time on the clock by turning the adjustment knob on the back clockwise.
Set the alarm on the Big Ben clock by turning the alarm knob and adjusting the dial on the face of the clock to the desired ring time.
Arm the alarm by pulling outward on the alarm knob.
Press the alarm shut-off button on top of the clock to stop the ringing.