WithU Watch is an exclusive feature only available on WithU Unlimited.
If you have the most up-to-date version of WithU on your iPhone and your phone and watch are paired, the WithU Watch app should appear on your Apple Watch.
If the WithU app is not on your Apple Watch:
Make sure that you have a WithU account set up and you are logged in on your phone app
Head to the Apple Watch app on your phone
Find WithU on the list of apps, hit the install button and you should all be set
If you are having any issues pairing your watch please contact [email protected].