Hi there! I’d be happy to help you update your account and billing information on the Jack in the Box app.

To get started, could you tell me if you’re encountering any specific issues or error messages when you try to update your info? Also, are you using the Jack in the Box app on your Macintosh device through a browser, or on a mobile device? This will help me guide you more accurately.

In the meantime, here’s a general step-by-step guide to updating account and billing info on the Jack in the Box app:

1. Open the Jack in the Box app or visit the Jack in the Box website and sign in to your account.
2. Go to the “Account” or “Profile” section. This is typically found in the menu or user icon.
3. Look for “Billing Information” or “Payment Methods.”
4. Add or update your credit card or billing details.
5. Save changes and verify that your new information is reflected correctly.

If you are using your Mac’s browser, make sure it’s up to date (Safari on OS X 10.15.7 supports the latest web standards, but you can check via Safari > About Safari).

Let me know more about the problem you’re facing, and we can take it from there!