Remove back cover.  Push white program button on electronics board one
time.  You will hear two beeps.  On keypad, punch in desired code;
then push the "open" button to enter it into memory.  (Your code can
be from two to eight digits.)  Upon entering code into memory, you
will hear another two beeps.  If unit does not beep, you waited too
long.  Repeat process without pausing.