Your location updates automatically thanks to the geolocation feature of your phone. If you want your location to be precise on yubo, you need to allow it in the settings of your mobile (you have allowed this when you create your account on yubo.)
If you move somewhere else and you want your location to update, you can do it in the settings on your profile. You just have to click on the “city” button and your city will update.
This feature is not available on Android devices yet, it will be released soon!