Once CloudFlare is activated through your cPanel for first tiime, you also get an account at www.cloudflare.com. The basic statistics and settings are shown in your cPanel. To see more statistics, Threat Control panel and all the CloudFlare settings, you have to login to your www.cloudflare.com account.
Hint: The temporary password is included in the initial welcome email. Before activate CloudFlare for first time through your cPanel make sure you have updated the contact email address in your cPanel.