My Apple Watch is stuck on a screen
How how do I get my watch off this screen to pair to my phone
Apple Watch Series 3, watchOS 6
Question marked as
Perhaps best to start with a hard reset first:
Press and hold both the side button and Digital Crown for at least 10 seconds, then release both buttons when you see the Apple logo.
Then check in here for the pairing instructions, including the troubleshooting tips:
Set up and pair your Apple Watch with iPhone - Apple Support