For Android Wear 2.0 and 3.0 watches, you will need to install the Golf Pad app from Play Store on the watch. Please follow the instructions on this page and search for Golf Pad to get the watch app:
https://support.google.com/androidwear/answer/7314014?hl=en
For detailed instructions on setting up the Golf Pad app on Android Wear OS 2.0 and 3.0, please see this article: Setting up Golf Pad watch app on Android Wear OS.