If you recently purchased a new BestWebsiteCompany hosting account, you should type the following information into the address bar of your browser:

http://YourSitesIPAddress/cpanel
(Example: http://1.2.3.4/cpanel)

If your domain name is already pointing to BestWebsiteCompany, then you can use the domain name to log into cPanel. Here is an example:
http://www.yourdomainname.com/cpanel
or
http://cpanel.yourdomainname.com/