There are two configure.php files that are generated when the installation is done. Since your store is showing up correctly, the includes/configure.php is probably correct.

Unless you used a script to load Zen Cart (not recommended), you should have been directed to rename the folder admin to something you would remember.

Let's say you decided on my_admin as the new name. Then, you should find the other config file at my_admin/includes/comfigure.php. Copy that file here so that we can see the settings BUT make sure you x-out the database username and password.