How to change autofill address on my Mac mini?

When you go to the Safari autofill menu and click edit it should show your address from the contacts app where you can change it.

Using Chrome:

1. Open Chrome on your Mac mini.
2. Click on Chrome > Preferences in the menu bar.
3. Click on the "Settings" tab.
4. Scroll down to the "Autofill" section.
5. Click on the "Edit" button next to "Credit cards".
6. Delete the existing credit card information.
7. Enter the new credit card information, including the name, number, expiration date, and security code.
8. Click "Done" to save the changes.