At first signup and activate CloudFlare from cpanel from CloudFlare menu under "Software" section/tab.
After that follow this if you can't setup for domain.
CloudFlare can only accelerate and protect CNAMEs, not A records, which often includes the root domain. If traffic goes to
a root domain and you want to accelerate and protect the traffic using CloudFlare, you can add a redirect to ‘www’ in your
.htaccess file.
If the user does not forward the traffic, then any traffic to www.mydomain.com will be accelerated and protected by CloudFlare
(and shown in the statistics) and any traffic to mydomain.com will not be served by CloudFlare. # Rewrite added for CloudflareInstall - mysite.com
RewriteEngine On
RewriteCond %{HTTP_HOST} ^mysite.com$ [NC]
RewriteCond %{SERVER_PORT} ^80$
RewriteRule ^(.*)$ http://www.mysite.com/$1 [R=301,L]