how can i view + edit my credit card payment method details?

hi there,

this morning i renewed my plan for a year but couldn't see where/how to enter my credit card details. on the Payments dialog a default option for a recurring payment is checked. however when i check the single payment method, i was expecting an option to enter/verify which credit card details to use for the payment.

would appreciate it if somebody can point me to how to do that. thanks in anticipation + cheers;