If you need to reset your Chamberlain garage door opener, there are a few things you'll need to do. First, locate the Learn button on your garage door opener. This is typically located near the top of the unit. Once you've found the Learn button, press and hold it for approximately six seconds. After six seconds have passed, release the Learn button. Next, press and release the remote button on your garage door opener's remote control unit. Finally, press and hold the remote button again for approximately six seconds. Once you've completed these steps, your Chamberlain garage door opener should be reset and ready to use.