liftmaster Chamberlain Garage Door Opener Transmitter 300MC "power key pad" Questions

...key pad Press the square button on the power unit (near where all the white wires connect). After you press and release the button you will have 30 seconds to enter the code you want into the keypad ...

...power. Sears states to push and release the learn button and then enter your new PIN number in the keypad and hold the enter button until the opener clicks two x or the lights blink. I cannot get it ...

...by 1/2 inch button. There will be a little Led Light beside it. Press a remote button and watch it if it lights up you have power to opener. If it does not light your board went out. Replace Key ...