If you need to change the credit card associated with your Lyft account, you can do so easily from within the app. Here's how:
1. Open the Lyft app and tap on your profile photo in the top left corner.
2. Tap on 'Payment' and then 'Add Payment Method'.
3. From here, you can add a new credit or debit card, or edit an existing payment method. To add a new card, simply enter your card number, expiration date and security code. Then tap 'Add Card'.
4. Once you've added your new card, it will become your default payment method for future rides. However, if you need to use a different card for a particular ride (for example, if you're splitting the fare with someone), you can select it as your payment method when requested during that ride.