How do you change the combination on your master lock and the product number is 0910M?

To change the combination on a Master Lock 0910M, start by opening the lock using the current combination. Once it is open, locate the reset lever or button on the side of the lock. Move the lever to the reset position, then set your new combination by turning the dials to your desired numbers. Finally, return the reset lever to its original position, and test the new combination to ensure it works properly.