Host : www.johnbernardabella.com
Database : localhost
Username : test
Password : test

After we need to modify system\application\config\config.php

Look for :

$config['base_url'] = ''

change to :

$config['base_url'] = "http://www.johnbernardabella.com/" //for we are using the web root of the server

Then Save.

Second is to open system\application\config\database.php

$db['default']['hostname'] = "localhost"; //Host of the database
$db['default']['username'] = "test"; //Username of the database
$db['default']['password'] = "test"; //Password of the database
$db['default']['database'] = "test"; // Database Name
$db['default']['dbdriver'] = "mysql"; // Database driver for this example I use mysql
$db['default']['dbprefix'] = ""; // Database prefix
$db['default']['pconnect'] = FALSE; // Connection type (pconnect of connect)

and you CI is now configured, it now able to connect the database.

Next topic would be tweaking defualt CI configuration.