ISNIC's office closes at 12 today and doesn't open again until Tuesday at 09 AM, due to 'Verslunarmannahelgi' (the Merchants holiday in Iceland).
Domains can be renewd at all times with a credit card. To find your user name (NIC-handle) please type the name of your domain in the big search window, here on ISNIC's front page, then log in or click on 'Lost PW' located by your email address, and then proceed from the email sent to you from ISNIC Hostmaster.
Have a nice weekend and drive carefully.
ISNIC's Staff.