How do I reset my I watch password

If you forgot your watch passcode, see here:

If you forgot your Apple Watch passcode - Apple Support

If you forgot you Apple ID password, then see this link:

If you forgot your Apple ID password - Apple Support

To unpair and erase watch and remove Activation Lock.

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.