How To Change Your Card On Cash App? If you want to change the card associated with your cash app, you will need to go into the "My Money" section of the app and select the "Add Bank" option. From there, you will be able to add a new debit or credit card. If you already have a card associated with your account, you can simply select the "ChangeCard" option. Once you have made your selections, be sure to hit "Save" in order to confirm the changes.