You can update your credit card information at any time when logged into your account. Go to "Account" one the left side of the page, and then under Account
Information you'll see "Manage Account and Subscription". A pop-up with
a place to enter your email will display and then you'll be sent a
one-time-passcode to access your billing portal. Select your "Payment Methods" under your current plan and then you'll see options to make changes.