How to change billing address

This support article includes how to change a billing address as part of editing a payment method for your account -->

Add a payment method to your Apple ID - Apple Support

On an iPhone/iPad:

1. Open the Settings app.

2. Tap your name.

3. Tap Payment & Shipping. You might be asked to sign in with your Apple ID.

4. To update the address for a payment method, tap the payment method, then edit your information. Tapping the method should reveal details for that method including the billing address. You might need to enter the security code that's printed on your credit or debit card. If you see Apple Pay after the last 4 digits of the card number, go to the Wallet app to edit the card information.

5. Edit the method then tap Done

There are also explanations of how to do this on a Mac or a PC.

Add a payment method on your Mac

1. Open the App Store.

2. Click your name. If your name doesn't appear, click the Sign In button, sign in with your Apple ID, then click your name.

3. Click Account Settings.

4. Next to Payment Information, click Manage Payments. (If you're using an older version of macOS, click Edit next to Payment Type.)

5. Click Add Payment.

6. Enter the payment method details, then click Done.

Add a payment method on your Windows PC or Microsoft Surface

1. Open iTunes.

2. In the menu bar at the top of the iTunes window, tap or click Account, then tap or click View My Account.

3. Sign in with your Apple ID.

4. Tap or click the Manage Payments button next to Payment Information. (If you're using an older version of iTunes, tap or click the Edit button next to Payment Type.)

5. Tap or click Add Payment.

The article "Change your Apple ID country or region" describes how to change your country setting on everything using your Apple ID, and the requirements and results of doing this --> Change your Apple ID country or region - Apple Support