cPanel is the centralized control panel for your your standard hosting account. You can access your cpanel by appending :2083 to the end of your domain name, or visiting https://rssd5273.webaccountserver.com:2083. The username and password can be found in the email sent to you when you signed up titled "New netfish.es Hosting Account Information". Once you log into your cPanel, you can create or manage email accounts or forwarders, FTP accounts, databases, sub-domains, and databases, as well as access the site builder and many other useful features.
For more about using cPanel, refer to the cPanel user manual
