You can access your account Control Panel by typing in your domain name or IP Address in the following format:
http://yoursitename.com/cpanel
or
http://ip.address.right.here/cpanel
Or course, be sure to use YOUR domain name in place of "yoursitename.com". By putting the /cpanel on the end it will bring up a username and password box to enter your Control Panel. Use the username and password assigned to you in your account setup email. Also, be sure to use the actual IP address assigned to you in your account setup email in place of where it says "ip.address.right.here".
More information about the Control Panel can be found in the section entitled "Control Panel Features".