Click here to see our How To video on this topic. Push in the reset button (the small button at the end of the security lock) using a pen or a pin. Slide the reset button across so it is at an angle. Input your new code into the lock, ensuring that the chosen numbers line up with the central notch. Remember at this stage to make a note of your new code! Push and slide the reset button back into place. Your combination is now set.