Apple Watch/id
How can I remove my Apple ID from old watch and add new ID?
User profile for user:
Community User
Either this;
Unpair and erase your Apple Watch
Or this;
On a computer, go to iCloud.com and sign in with your Apple ID.
Go to Find Iphone.
Select All Devices, then click your Apple Watch.
Click Erase Apple Watch.
Select Next until the device is erased.
Click the remove button next to your Apple Watch.