I don't think you need to reset them, do you?
As far as I know, it's controlled by the main unit, so all you need to do is enroll the keypad in the system.
Should be able to press and hold the * key followed by F5. Hold both for 5-10 seconds or until you see "Exit when done, F1 set addr"
Press F1 to display current address setting
Select desired address by entering a number that's not in use.
Press exit when done.