You can change how you pay for subscriptions at any time when logged into your account.
Simply navigate to the menu item ACCOUNT and choose SUBSCRIPTIONS & BILLING from the drop down menu as shown below:
Then scroll down to the "MY CURRENT PAYMENT INFO" section and click CHANGE as shown below:
From the pop-up window that opens you can either choose a different payment method or create a NEW one by clicking NEW:
Next, choose whether the new payment method is MANUAL / EFT or CREDIT CARD from the drop down then click OK.
If you chose Credit Card, the Payment Gateway window will be displayed where you can securely capture your credit card details.
Your new details will now be used for future subscription payments.