Align the dials so each one reads zero. This is the preset for new locks but also is used to reset the combination on used locks.
Pull up the lock shackle and rotate it 90 degrees. Press the shackle down firmly.
Set the new combination while holding the shackle down. The numbers that align with the red lines will be your new combination. Do not release the shackle until all numbers are aligned.
Release and pull up on the shackle. Place the shackle back into its locked position. If the shackle will not lock because of the new combination, move one of the number dials and the shackle will lock.