1.The lock is preset at factory to open at 0-0-0. check the 0-0-0 aim at indication line. Press down the snap. Now the lock is ready to open 2.Press down the button with sharp tool, hold the position until next step 3 is finished 3.Turn the character wheels to set your personal combination 4.Release the button, now your private combination is set 5.Remember well your new combination. If you want to change it again, please repeat