Open the Zero Halliburton case with the existing combination. Put the code in, push the button to open the case and leave the case all the way open.
Move the small lever behind the lock to the left. This lever will lock in place. Once it's moved the combination is ready to be changed.
Put your new combination into the dial. Once the numbers are set and squared up, release the lever behind the lock to set the new combination. Close the case, scramble the numbers, and then put them back to your new combination to make sure the new combination works.
