Converting to Multisite (GoDaddy WP Hosting)

REFERRENCE SITE: http://cls-manager.com/
I have followed the instructions to add "define('WP_ALLOW_MULTISITE', true);" to install Multisite on my GoDaddy WP hosted site and my site is no longer visible. I have tried re-placing the original wp-config.php back, but this has not worked as well. How can I fix this?