You can create an additional website on your account by adding the domain you wish to use in the ‘Addon Domains’ utility of cPanel.
Once the domain is added, make sure you have updated your name servers and you can edit content on the website by using the destination folder selected during setup.
If you have exceed the maximum number of websites on your account, you will be unable to do this and a notice will be displayed requesting you to contact your web hosting provider.