To install Netref you just have to :

Edit option.php and enter connection informations

$host="localhost"; // Adress of your MySQL server
$user="root"; // Name of MySQL user
$pass=""; // MySQL Password
$bdd=""; // Name of MySQL base

$tablecatannu="NRef_cat"; // Catégorie of directory (don't change)
$tablesite="NRef_site"; // Site of directory (don''t change)
//pseudo(s) de l'administrateur
$psadmin[0]=""; //Name of admin for admin connection
$passadmin[0]=""; //password of admin for admin connection

//Langage
$landef="fr"; // Put "en" if you want an english directory
$lan_admin="fr"; // Put "en" if you speak English

//URL du site
$url_site="http://www.domaine.com/netref"; //Pur the URL of your site with Netref directory
$nom_netref="Netref"; // Name of the directory (What you want)
$email_contact="soumission@domaine.com"; // The email of the webmaster (to be noticed of the news submissions)
Go to /admin directory
Connect you with the pseudo & password of option.php file
Create table
Add sites and categories