How to change the Admin URL?

Edit the application/config/constants.php file using FTP and change the line number 97.

Replace 'admin' with your string (e.g. 'restrictedArea').

From:

defined('SITE_AREA') || define('SITE_AREA', 'admin');

To:

defined('SITE_AREA') || define('SITE_AREA', 'restrictedArea');