Enter your existing combination and open the lock. Look for a change switch or reset button inside the case, container, safe or locker. The button is sometimes located on the lock itself. It is separate from the container it secures.
Move the dials or push the buttons to enter a new combination. Leave the lock in position and move the button or switch back to its original position. The new combination is now programmed into the lock.
Test your new combination with the case, container, safe or locker open, it should open the lock if it has been programmed correctly. Close the container and scramble the combination dials. Your new code is now ready for use.