Put your AirPods in their charging case
Open the lid
On your Apple Watch, open Settings
Tap Bluetooth
Make sure Bluetooth is turned on
Keep the AirPods case near your Apple Watch
Press and hold the setup button on the back of the AirPods case until the light flashes white
Wait for your AirPods to appear under Devices
Tap your AirPods to connect
Open the Now Playing app or play audio to confirm the connection