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top of screen says download manual
http://chamberlain.custhelp.com/app/answers/detail/a_id/1123/~/liftmaster-model-976lm,-976lmc-wireless-keyless-entry-owner's-manual
The inside button is hard wired. The keypad is a small radio transmitter. If the battery in the keypad is good and it doesn't work when you put in the code it has probably just quit.
Make sure the battery is good and then locate the smart/learn button on the rear of the motor unit near where all those white wires go. Press and immediately release this button and then walk over to the keypad and key in a 4 digit code and press enter.
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