You can change the Billing Details for your account by logging in and clicking the Settings tab, then choosing Credit Card in the left-side menu. Update your Billing and Payment Details and save your changes by clicking on Update at the bottom of the page.
You can also access this page via the following link, while already logged into your account: https://hello.freeconference.com/conf/settings/general/credit_card
Note that we do not require any credit card details for use of the free subscription. Payment information is only required for those who are subscribed to a paid plan to enable access to premium features.