I can't add a new payment method for iTunes

Click on the links below to read about ways to cover immediate expenses:

- Create and add money to an iTunes Pass - "At Apple Stores and select retailers, you can add store credit directly to the Apple ID that you use for App Store, iTunes Store, and iBooks Store purchases." - https://support.apple.com/HT203021

- Redeem your App Store & iTunes Gift Card --> https://support.apple.com/HT201209

Eventually:

- Add a payment method such as a credit or debit card to your account. See this link about 'Payment methods that you can use with your Apple ID' --> https://support.apple.com/HT202631 then see this link about how to 'Change, add, or remove Apple ID payment methods' --> https://support.apple.com/HT201266

- Add funds to your Apple ID balance - "Use a payment method, such as a credit or debit card, to add funds to your Apple ID balance." This takes the previous payment method one step farther by optionally using it to irreversibly add balance to an Apple ID instead of having the card charged each time.

Click here --> https://support.apple.com/HT208687

Ah, you omitted to provide the key component about the context of all this. :-( Ask Apple what to do:

click here --> https://support.apple.com/choose-country-region/media-services Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.

or:

Contact Apple for support and service --> "See a list of Apple phone numbers around the world." - https://support.apple.com/HT201232