Try to hook up my versa 2 watch to my phone

Which is it you do not have? To connect a Fitbit device to an iPhone, search for Fitbit: Health & Fitness in the App Store. If you do not already have a Fitbit account, you will be required to set one up.

If you want to connect a 3rd party watch to your iPhone, you need to download the appropriate app and, for any problems, you can contact the app developer (Fitbit) and ask for help.

Regards

Giulio