Hi
On your iPhone, in the Clock app > World Clock > Tap Edit to add / remove (eg delete Gustavia) / reorder locations on your list, then tap Done.
- Add any other city that you would like to be able to show the time for in the World Clock app and/or on your watch face.
When customising the watch face on your Apple Watch (via firm press on watch face > tap Customize):
- Swipe left until you can select individual face features > Tap the one you’d like to use for a world clock > Turn the Digital Crown to choose a city (it offers each location that you set up on your iPhone) > When you’re finished, press the Digital Crown.
The World Clock complication is available on these watch faces: Chronograph, Color, Mickey Mouse, Modular, Simple, and Utility (and you can add more than one on some of them).