Changing a luggage lock combination is a good idea for several reasons. The preprogrammed combinations that come from the factory are easy to guess. A personalized combination prevents strangers from opening your luggage. It is also easier for you to remember. You should change your luggage lock combinations as soon as you get a luggage lock.
Unlatch the luggage lock. It will come from the factory with a preprogrammed combination. This is usually something simple like 0-0-0-0, 1-1-1-1, or 1-2-3-4. If the lock does not open, look around for a piece of paper from the manufacturer revealing the combination. If you can't find one, contact the manufacturer and ask what their default code is.
Dial up the new combination on your luggage lock. Make sure that the numbers line up on the line or in the window. It is a common mistake to be looking in the wrong place when dialing up the numbers.