To save a credit card on Flipkart, follow these steps:

1. Log in to your Flipkart account on the app or website.
2. Add a product to your cart and proceed to checkout.
3. Enter your delivery details.
4. Select the payment method as Credit/Debit/ATM Card.
5. Enter your card number, expiry date, and CVV.
6. Choose the option to save the card for future transactions.
7. Complete the payment by verifying with the OTP sent to your registered mobile number.

Once saved, your card will appear in the "Saved Cards" section under Payments in your Flipkart account for quicker future checkouts. You can remove saved cards anytime from the same section if needed.