This guide explains the steps on how you can update your credit card details from your Account Page.
To update your credit card information: Sign in to your account on AddEvent.com. Navigate to your account page using the drop-down menu in the top right corner of the website

Once you're on your account page, scroll down to the "Membership & Billing" section and click the white 'Change Card' button, as shown in the image below. A white pop-up will appear where you can enter and save your new credit card information.