We use a service called Invoiced for our billing. In order to update your billing information you can do the following:
Go to https://sighteneverbright.invoiced.com/login
Enter your billing contact email
Invoiced will send an email to the billing contact email with a link to your payment information
Click on this link to update billing contact information and payment method
If you do not know your current billing contact email, please reach out to support@sightensupport@goeverbright.iocom and we will provide you with the email.