Updating or adding a credit card can be done from the dashboard directly.
Manage your credit cards
Once signed in to your dashboard, click Settings in the left menu and scroll down the page.
You should see action buttons (Update, Delete, Add).
Note that If you haven't made any purchases yet, you will not be able to manage your credit cards.
Issues updating your credit cards
Should you have any issue with the credit card settings, please get in touch, we'll help you with this.