Summary
This host is running osCommerce, a widely installed open source shopping e-commerce solution.
See http://www.oscommerce.com for more information.
The store admin directory on your server needs to be password protected using .htaccess.
Most of the time the server you are hosting your store on has the ability to password protect directories through the server administration area so check with your host.
Solution
Limit access to the directory using .htaccess.
See http://www.oscommerce.info/docs/english/e_post-installation.html for further Information.