If you pay for your hosting by Montly Invoice you will be emailed with a reminder 7 days before the due date. It is important you pay this invoice as soon as possible as if your Invoice remains unpaid after the due date your account will be suspended and finally removed 7 days after the due date.
To pay an invoice go to the billing system and login. Then click "My Invoices", It will show all your invoices and their status. Either Paid or Unpaid. Click the "View Invoice" for the Unpaid invoice to vire a summary of it. You can then click the "Pay Now" Button on that invoice page to pay your invoice via Paypal