Firstly you will need to update your name servers with your domain register, please consult with your domain register on how to do so.
Login to the cPanel
For this tutorial you will need to be logged into your cPanel account, if you don’t know how to login to your cPanel account please follow this tutorial.
At the top of cPanel their is a search bar, search for “Addon Domains” and select it
You will need to put your domain name in the domain name box, the subdomain box will be the prefix it will have over your current domain, and the document route is where the files for this domain will be located.