Q: how do you change a credit card to be charged for icloud services?

Hello melissae906,

How to change your credit card information for iCloud services is explained here.

iCloud storage upgrades and downgrades - Apple Support

View or change your Apple ID payment information

When you upgrade your iCloud storage plan, the upgrade will be billed to the Apple ID that you use with iCloud. If you use Family Sharing and you use the same Apple ID in iCloud and iTunes, the upgrade will be billed to your family organizer.

Use the steps below to view or change your account information, such as your credit card number, billing address, and more.

iPhone, iPad, or iPod touch

Go to Settings > iTunes & App Store, tap your Apple ID, and tap View Apple ID. Then tap Payment Information, and update your account. You might need to enter your Apple ID password.

 

If you use different Apple IDs in iTunes and iCloud, you might need to sign in with your other Apple ID in iTunes.

There are also instructions for changing it on a Mac or PC.

Best regards,

Nubz