How do I reprogram it I have a liftmaster opener.there isn't an "enter button on the keypad

Locate the smart/learn button on the rear of the motor unit near where all those white wires go. Press and immediately release this and then walk over to the keypad and key in any 4 digit code you like and press enter.

If your keypad doesn't have the enter button it is an earlier model and will not work with what you have now. You will need to call your Liftmaster dealer to get the latest model.

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.

Change the battery in the keypad and reprogram
Program:
1- find learn button on back of motor
2. push the learn button ( LED stays on for 30 seconds)
3. during the 30 seconds enter a 4 digit code on the keypad , then press the enter button for 5 seconds
NOTE: do not pass throught your safety sensors when programming

Your keypad may be bad. If you press and immediately release the smart/learn button and then key in your 4 digit code and press enter the keypad should be working. Be sure you have a good battery. Actually the flashing of the keypad is indicating that it is sending the signal to the receiver. Holding the enter button in doesn't do anything extra.

On the rear of the g. door opener, there is a learn buttom.

The first step is to push this button in.

Then go to the remote and enter the new code you want

Press and hold the enter button.

The lights will blink and or you will hear two clicks.

The code you entered should be learned and ready to use

You are using a universal keypad and usually the 0 button is "enter" look up directions for the brand keypad you are using

Reprogram keypad. Press learn button on back of opener, then press in 4-digit code and press and hold enter on keypad. Light on opener will blink.

To program the keypad, you will have to press the LEARN button on the back of the garage door opener console and when it begins to flash, enter a new 4 digit code on your keypad and press enter. You should hear a click and see the lights on the opener flash.

The keypad outside has manuals online that you could use, but for simplicity, Have someone go to that back of the machine and press the "Learn" button, once its is pressed, the yellow light should blink. Enter a new code (4digit) into the keypad and press the enter button. You should then hear a click and the lights on the machine should flash. That will program your keypad.