Most used payment methods are: credit/debit card, PayPal, wire transfer, WebMoney. If you wish to use other - contact support.
How to update credit card for billing?
Visit Billing page and click "use other" in Payment method field next to the current card. Select "New Credit/Debit card", enter the new CC info and perform the payment for minimal amount. All further payments will be taken from the new card, and the paid amount will be subtructed from the next charge.