After logging in to your Yu ID, you can delete or change your payment information from “Yu ID membership information” > “Payment method.”
Note that the payment method for “Card advance payment (Smartphone Discount)” in the Japan Post Official App (JPN ver only) is different from the above.
For how to delete or change the payment method for “Card advance payment (Smartphone Discount),” please refer to the following page.
https://faq-app.pf.japanpost.jp/hc/ja/articles/10400384842255