How can I change my payment method or payment billing address for my icloud?

Hi Nhungo03,

Welcome to the Apple Community.

There is another discussion thread which answers your question:

https://discussions.apple.com/thread/252979758

Hope this helps you update your Billing adddress ok:

Else:

Apple have a billing page with links to various options online:

https://support.apple.com/billing

All the best :)

I need to change billing address