You can customize Watchface Builder if you choose settings from the main menu.
Set your watch type to show the right preview for round or square watch devices.
Choose between simple and expert edit mode. If you choose expert you will have accesss to more layer properties.
Set the frequency of battery updates on your phone.
Set the frequency for weather updates on your phone.
Choose between celsius or fahrenheit as temperature unit.
If you want to choose your location manually instead of using the location from phone. Enter a city name to receive weather updates for this location.