Using the Adafruit NeoKey FeatherWing is easy. First, plug the FeatherWing into your Feather main board. If you have your MX - compatible switches, insert them into the Kailh sockets on the wing. You may want to use a bit of hot glue or epoxy to keep the switches firmly in place. When connecting the switches, note that Switch A goes to the Feather pin left of SCL (usually D5), Switch B to the pin two pins left of SCL (usually D6), and NeoPixel Input to the pin three pins left of SCL (usually D9). You can also use the STEMMA QT connector to connect other sensors and accessories, but you'll need to buy a compatible cable separately. Remember, you need to solder the break - off header to the FeatherWing PCB and then connect it to the Feather. Keep in mind that mechanical switches and key caps aren't included, so make sure you have your preferred MX - compatible switches. For maintenance, keep the FeatherWing clean and dry. Avoid getting it wet or exposing it to extreme temperatures. If you need to re - wire the switches or LED strand, use the jumper pads carefully. With proper use and care, your NeoKey FeatherWing will serve you well.