I would like to change my credit card.

Here is guidance on how to change the payment method for content purchases from Apple→If you need to change or update your Apple ID payment method - Apple Support

Follow the instructions in the link I provided, summarized below:

Update your payment method on your iPhone or iPad

1. Open the Settings app.
2. Tap your name.
3. Tap Payment & Shipping. You might be asked to sign in with your Apple ID.
4. Tap Add Payment Method, enter the new payment method, then tap Done.
5. Tap Edit.
6. Tap the red delete button next to the old payment method, then tap Delete.