reset iWatch to new Apple ID
I changed my Apple ID on my iphone and now have to reset it on my iWatch, but don't seem to be able to.
I suggest you try to unpair the watch (using your old Apple ID), then pair it to your iPhone using your new Apple ID. BTW, did you change your Apple ID according to:
Change your Apple ID - Apple Support
What to do after you change your Apple ID or password - Apple Support
or did you create a new Apple ID? If you changed it according to the above links, you should not have this problem.