Changing address

Change, add, or remove Apple ID payment methods - Apple Support

It is a long process. You can follow the steps given below:

Settings > Profile Name > iTunes & App Store > tap on Apple ID > View Apple ID (you may need to enter your Apple ID password or thumb impression or use Face ID) > Manage Payments > Tap on Credit/Debit Card info > under BILLING ADDRESS, tap on your Name and address. Finally, you can change your billing address on your iPhone/iPad.

Probably, the screenshots below might help you. My friends are requested not to use these screenshots for any commercial or non-commercial use as they are taken on my personal iPhone.

[Image Edited by Moderator to Remove Personal Information]