Is this setup on a local or live server? You were able to get through the installer correct? The super admin user is the one that you set a username and password for during the setup. You can check in the wa_settings table in your db to confirm though.
How you check on your db depends on weather you are local or live and what tools you use. If you are working locally you should be able to use the MySQL administrator or workbench, or you can use SQLyog. If you are on a MAC I would suggest using sequel pro, it is a very good MySQL gui.
If your db is live then your host should have access through a control panel where you can login to the existing db's to manage them and view the records. If you have altered the pages too much by adding in more security it is possible that you have altered the the functionality of the security checks. If you can't login with the values in the wa_settings table then you may need to reload the files to get them back to their original values.
