Log into your account
Visit your [My Agency] tab
Click the [Billing] sub-tab (if you do not see this tab, you may not be listed as the agency administrator)
Lastly, click the link that reads "Want to make a one-time credit card payment?" submit payment. See screenshot here for reference.
Once the payment has settled, a receipt will be emailed to the billing contact on the account the very next day.
If you experience and difficulties or have questions please don't hesitate to contact our support team at 1-888-764-0633.