You can reset your Hometown in the app yourself. Go to "Settings" -> "More" -> "Hometown" in Android and follow the instructions. In iOS, click on "Profile icon" (bottom right) -> "Gear icon" (top left) -> "Hometown". In order to make a certain place your Hometown, you need to be there at that moment.
Please note that you can reset your Hometown only once. Should you need to do it again, please contact our Support Team and they will be happy to reset your Hometown for you.