On the clickonIT.com.au website select the menu option "Client Portal".
We begin to login at the Portal Home. This is the Login Page for the Client Area of WHMCS. It contains a line for the email address and a password. They are different than the login details for your cPanel.

Enter your email address. Then enter your WHMCS Password. Now click on Login. That's all.
You are now logged in to WHMCS and can begin to manage your hosting services, invoices, billing information, and more.
When you are done, use the breadcrumb link to take you back to the Portal Home.
Now you know how to login to your Client Area.