If you have the lock box open and want to reset the combination. You will see the screws with numbers below them. Each screw has an arrow stamped on it. To turn off the combination and reset, turn all the arrows to the left (OFF), than pick the 4 number you want as your combination, you can only use the number once such as 1234 you can not use suplicate numbers, go ahead and turn the screw to the right you will see the arrow pointing to the right, you number is now set. Now you can try unlocking the lock.