How do I pay from my MacBook Air?

You can make payments towards your Apple Card balance in any web browser on your MacBook Air. Here are the steps do so:

1. At card.apple.com, click Payments in the sidebar.
2. You can make a payment at the bottom of the page.
3. Enter a payment amount or choose a suggested amount.
4. If you already made a payment or have one scheduled, you may need to click Pay Now, Pay More, or Pay Installments Early before you can add an amount.
5. If you haven’t added a bank account, you’re asked to enter and confirm a routing number and an account number.
6. Choose a payment date, then click Pay
7. 
8. If you added multiple bank accounts, select the one you want to use.
9. Click the Pay button again.

You can learn more here: Pay your Apple Card balance online - Apple Support