This article explains how you can add or edit your billing information
Go to your Client Area and login using your email address, and the password you use to login the client area in our site - If you don't remember your password, click 'Forgot password?'
Once you're logged in, click the dropdown on the top right (should say "Howdy, Name"), and click 'Manage Credit Card'
Enter your new credit card details and click 'Save Changes'
If billing address has changed
If your billing address has changed, go ahead and click the top right dropdown again and select 'Edit My Profile'
From here you can adjust your address on file and other details. When you are done with the changes, click "Save Changes".