Locate the configuration.php file in the root directory. Open the configuration.php file and scroll down the file and you will see the following lines:

    var $dbtype = 'mysqli' or 'mysql';
    var $host = 'localhost';
    var $user = 'username_mysqluser';
    var $db = 'username_mysqldatabase';
    var $dbprefix = 'prefix_';
    var $password = 'mysqlpassword';

var $db field is the name of your database – username_mysqldatabase;

var $user field is the name of the mysql user added to your database;

var $password field is the password for your mysql database to access.

A simple tip from
Ultimatecine.com