It doesn't matter if your computer is a MAC or a PC - the CPanel login still works the same.
To LOGIN to your CPANEL,
There are TWO WAYS:
The FIRST way is the shortcut:
The SECOND way:
1. Login to your Billing Account at www.HostingCheck.com/billing/
2. CLICK ON - "My Services" Tab
3. CLICK ON - the "Manage" BUTTON.
4. This will take you to a screen where you will see a Button that says "Login to Cpanel" - Click that button. The Cpanel should load up in a New Window.