To lock your bicycle properly place the lock around a fixed object (bicycle rack, sign post, parking meter if they are secure) and your bicycle frame, and use the Quickzip to lock the wheels to the bicycle frame. Note: Recommended as a secondary locking device for securing unattended items for short periods of time. (1) Remove the strap from the lock head. (pre-set to 0-0-0). (2) Use a flat head screw driver to press and rotate the reset knob 90 degrees. (3) Set preferred 3-digit combination. (4) Use flathead screw driver to rotate the reset knob 90 degree, the knob will rise to the original position. Slide release button to set.