Use the self-service billing portal to update your credit card details.
Step 1: Open the billing portal
Click on your username in the upper right corner to expose the dropdown menu, then select the billing portal from the list of actions.
Step 2: Add a new payment method
Click on the small pencil icon next to the current payment method.
Step 3: Add the new payment details
Click on the "Add payment method" radio button, and then fill in the fields. When you're finished, click the "Update" button at the bottom of the page.
Step 4: Return to ImpairMaster.com when you're done.
