Please log in to your cPanel using one of the following:
1) cpanel.yourdomainname
2) yourdomainname/cpanel
3) From within your user account Dashboard
a) Login to your account
b) Select 'My Hosting Accounts' on the left hand side
c) On the right of the domain name under 'Tools', click on the first icon 
. This will take you to your cPanel.
If you choose options 1 or 2, the login credentials are in your cPanel Hosting Confirmation e-mail.