Our billing system is located at https://clients.tcadmin.com
Once at the page click the Client Area icon. Then click on the My Invoices link at the top of the page. Here you will see a listing of all your current and past invoices. Next to each invoice you will see Paid or Unpaid under the Status column. To the right of that column you will see the View Invoice link. Click this to open the invoice. At the top right of the invoice you will see the option to pay the invoice. You can choose either Paypal or Credit Card. Choose your preference and pay your invoice.
If you have any questions or problems feel free to contact us at firstname.lastname@example.org