Ruka Goldshark

I tried to change credit card information. Though there is a button of "Add Paypal",the place where credit card information can be updated is not found. Then, I deleted the current card information. However, the place where card information is newly input doesn't appear. I tried "Change in the payment method". However,because both "Add Paypal" and "New payment method" radiobuttons light, I cannot do the following procedure. Where can I renew my credit card information?