Once you login to cPanel with following steps.

Step 1: Login to your Hostzy Dashboard.

Step 2: Go to Manage Hosting

Step 3: Select Product > In Left sidebar you can see cPanel login button and Login details.

To add more domain or more website:

Step1: Please go to cPanel 

Step2: Go to Domains

Step3: Add domain under Addon Domain

(But before doing this make sure you have pointed your domain to our nameservers)