I need to dault my credit card and use my gift card

What is dault your card?

Hello! I am having some issues understanding your question, if you are meaning to delete your credit card. I'd be more than happy to help, to delete your credit card, go to settings, click on your contact card (Top of settings, usually says your name.) Click payment options, click on your credit card and delete it. If you currently have an active subscription on file, cancel it by going to the app store, clicking on your Apple ID profile picture in the top right corner, then clicking subscriptions. If your subscription is not run through the App Store, go to the app with the subscription, and cancel it from there. Depending on the app, you may have to wait until the time period is over to remove your card.