If you need to update your payment credit card, view or change billing details or view past invoices see below. You can also update your password, name and phone number from this menu.
Click in the upper right corner by your name then click on Manage My Account.
Click on Billing Info.
You will then be brought to a billing screen where you can change your payment details, view past invoices and payments. You can add and update your credit card details here.