Sorry, WP - procedure is the same. If You have used some kind of cPanel (hosting company interface) to install WP, then You have all those files somwhere on your ftp - find them, backup then, copy wp-config.php to your desktop, as You will find there all the information about database connection (if You don't know how to check them with cPanel/other panel, or create new mysqldatabase), then to the same folder upload unzipped WP quickstart and access your site online - installation process will start, You will provide some basic informations (site name, email, database configuration), and everything should be exactly as on demo.