This is a tutorial on aliases, often known as parking a domain. If you aren't sure what that means, read this.
If you are wanting to add a second website, you should be reading about Addon Domains instead
To add an alias, log into your domain management panel: cpanel.yourdomain.com.au
Your login details are in the welcome email you should have received. If you can't find it, lodge a support ticketand it will be resent
Don't be intimidated by all the offerings in cpanel, it can be overwhelming. Also be careful you could break the internet...well, maybe just your website...no kidding.
You are looking for the Domains section and particularly the Aliases icon - click it
You'll see the following screen. Enter the domain name.
That was easy. But once you have the alias set up you may want to redirect it to somewhere, otherwise it is an orphan in a void (to mix my metaphors).
In my case I am going to send any visitors to the domain to 123host.com.au, so I click on the manage redirection link (on the right) and...
It is that easy. And, though I am not sure why you would want to, you can redirect to any other website, it doesn't have to be yours.
What about if you have the .com.au version of a website and you want it to point to the primary domain which is a .com? This is an example only since I don't have MrGeek.com, but you would simply leave the domain without a redirection so that it goes to /public_html which is where your primary website lives.
It sounds confusing but it isn't really. If it really doesn't make sense...
Stuck? Lost? Your brain stuck in park? Lodge a support ticket