♦ Update Credit Card Billing details:
To update your Credit Card information from the app, please follow these instructions:
1- Login with your account.
2- Click on My Music> Settings> Manage account
3- Tap on the Credit Card details> Edit
4- Enter your new Credit Card information and click update to confirm
♦ Update iTunes Billing details:
Changing your Billing details using an iOS device:
Tap Settings on the Home screen.
Tap iTunes & App Stores.
Tap on your Apple ID. (If you are not signed in, enter your Apple ID and password, and tap Sign In.)
Tap View Apple ID.
Enter your Apple ID password.
To update your payment information, follow these instructions:
In the Edit section, tap Payment Information.
Update the information that you want to change.
Tap the Done button when finished.