I need to update my credit card information for my account and can not see where to do that.

Welcome to Apple Support Communities. 

We understand you want to update your payment method. We are happy to help.

These steps may help. Please try these steps: If you need to change or update your Apple ID payment method - Apple Support

"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."

Let us know if you have further questions.

Take care.