If you are subscribed to the Doteasy Unlimited or Doteasy SSD hosting plans, you are allowed to host additional domain names on your hosting account at no extra hosting costs.
The additional domains that you add on to your hosting account are called add-on domains and you can add them to your existing Unlimited Hosting account from your account cPanel.
Here are the 3 steps you need to follow:
Register your add-on domain name(s)
Point your add-on domain(s) to your Doteasy name servers
Add the add-on domain(s) to your Unlimited Hosting account
For full step-by-step instructions, take a look at this article.
Or watch this video tutorial.