A Gibson case for your guitar comes complete with a three-digit combination lock. When the case comes from the factory, the combination is set to 0-0-0. Changing it from the factory combination or your own combination is the same process.
Remove the plastic retainer from the lock if you are changing the combination from the factory preset.
Set the combination to your current combination or 0-0-0, if you are changing the combination from the factory preset.
Slide the button used to open the lock to the right, opposite the direction you push to open the case.
Hold the button there and change your combination to a new three-digit code.
Let go of the button when you are finished.