Here are the general steps you can follow:

1. Locate the reset button: Depending on the type of garage pin pad you have, the reset button may be located on the back or bottom of the device. You may need to remove the cover or enter a specific code to access it.

2. Press and hold the reset button: Use a small tool, such as a paperclip, to press and hold the reset button for at least 10 seconds. You should see the indicator lights on the garage pin pad flash or turn off and on during this time.

3. Enter a new PIN code: After releasing the reset button, enter a new four-digit PIN code using the keypad on the garage pin pad. Be sure to choose a code that is easy for you to remember but difficult for others to guess.

4. Test the new code: Once you have entered your new PIN code, test it by entering it into the garage pin pad and verifying that it opens the garage door.

If you are still having trouble resetting your garage pin pad or opening your garage door after following these steps, it's best to contact a professional technician or the manufacturer for further assistance.