Open shutter door to access the combination dials and the release button. Rotate the dials to the current combination. If the lock box has never been used before, the combination is factory set at 0-0-0-0. Press down on the release button and pull the compartment door open.
Push the reset lever to the left and into the downward position. The lever will stay in this position until you've changed your combination.
Rotate the combination dials to the combination you want to use.
Push the reset lever up and back to the right, to its original position.
Close the lock box's door and scramble your new combination.