You can change your payment information in the profile settings.
Please follow this guide:
1. Open the Arkadium website.
2. Click Sign In.
3. Enter your email&password, and click Submit.
4. Click your Profile picture at the top right corner.
5. Select Payment and Subscription tab.
6. You can click on Manage Subscription on the left side, or Here on the right side, both will take you to your subscription management and order history.
7. Click Edit.
