If you want 2 (or more) Domain Names to both point to the same website, you will need to park a domain on top of the other. To park a domain, follow these steps.
VIDEO TUTORIAL HERE: How to park a domain
First, make sure the name servers on the domain you want to park are pointed to your name servers in your original Welcome Email.
This demo assumes you've already logged in to cPanel
Now let's learn how to park a domain
1) Click the Parked Domains icon
2) Enter the new domain you want to park here, then click Add Domain
Domain parking is useful when you have additional domain names that you want people to be able to use to get to your website
That's it! Now when someone browses to mybiz123.info, they'll automatically be redirected to mybiz123.net
Be sure to set your parked domain name's DNS settings to the same as your main domain or the redirection will not work
From here you can see a list of parked domains, and you can manage or delete these parked domains from here
You will also now be able to create email addresses associated with both domains.
This is the end of the tutorial. You now know how to park another domain name on your account from cPanel