Well our system is Linux / Apache, but you don't have the proper permissions to edit this file.
You can't edit httpd.conf. You'll need to make any changes necessary in an .htaccess file - you can override most stuff you'd need to override in here. If that won't work, we can add custom parameters to httpd.conf for you within reason.
You might want to first check and see if other people have had success installing this software on a shared hosting platform, and if so, how they did it.