Turn the safe's handle all the way so it is facing up in a horizontal position. Make sure the dial's pointer is set at zero.
Insert the safe's key into the lock. You can remove the key once the plunger pops out. The popping should happen automatically.
Turn the dial to the left, making sure the safe's pointer passes the number zero three times. On the fourth rotation, stop at the first number of your combination.
Turn the dial to the right. Stop the dial at the second number of the combination.
Turn the dial to the left. Stop turning as soon as the pointer hits the third number of the combination. If there's a fourth number, turn the dial to the right and stop at the fourth number in the combination. The safe's master lock will unlock if the combination is entered correctly.