After you Sign in to your MalCare account:
Step 1: Go to the Account option in the top right-hand corner.
Step 2: From the drop-down menu, select Billing & Invoices.
Step 3: It’ll take you to the Billing Info page where should be able to see a button called Change Card. Click on the button.
Step 4: On the next page add details of the new card and click on Save Card.
Learn more: How do I change my current billing address?