For individuals, it is easiest to log in to Stólinn on nova.is with electronic ID.

Once there, you will see an overview of your services at Nova and in the  options bar that appears, invoices and the customer statement list are accessible.

In the 'Hreyfingalisti' (customer statement) you will find invoices and receipts that have been issued on your kennitala at Nova.
Under 'Reikningar' (Bills) you will find your bills, paid and unpaid and you can choose to pay your bill - if you want!