Where do I find to change my new address

Here are the steps to change you address on your Apple Card MasterCard.

Update your Apple Card account information

1. Open the Wallet app on your iPhone and tap Apple Card.
2. Tap the More button .
3. Scroll to Billing Address, then tap your address.
4. Tap Update Billing Address and provide your new information.

Update your Apple Card account information - Apple Support

You will also want to change the address for purchases.

How to Update Apple ID Credit Card and Billing Address in iOS 

To change the credit card used with Apple ID for iTunes and App Store purchases on an iPhone, iPod touch, or iPad:

1. On the Home screen, tap ​Settings.
2. Tap your name.
3. Tap Payment & Shipping.
4. Enter the password for your Apple ID if prompted.
5. Tap Add Payment Method to add a new card.
6. To add a new payment method, tap either Credit/Debit Card or PayPal.
7. To use a card you previously added to Apple Pay, go to the Found in Wallet section and tap a card.
8. Enter the information for the new card, including the cardholder name, card number, expiration date, CVV code, a phone number associated with the account, and the billing address.
9. To use PayPal, follow the prompts to connect your PayPal account.
10. Tap Done to return to the Payment & Shipping screen.
11. Add or change an address in the Shipping Address field if you don't already have one on file, then tap Done.​​

You’re welcome, glad I could help!