On a three-way, there’s an additional terminal, known as the “popular.” Power comes in to the switch on the frequent, then two “traveler” wires hook up the first switch to the second to the brass terminals. Using a screwdriver, diligently take away the screws that keep the previous plug jointly. https://smartpowerpointsandswitch20740.blogdon.net/the-greatest-guide-to-smart-power-point-50800096