A parked domain is when you have TWO domains POINT to the same IP address.
In other words, lets say you already have an hosting account with us called:
mydomain.com
Now, you want to register the .net and .org version of your domain name and PARK them to your main account.
You would now have:
mydomain.com
mydomain.net
mydomain.org
WOULD all point to the same IP address, so that no matter which domain name you typed in, it would still go to the same site.
To Park a domain, you first have to have a web hosting account with us.
If you do have a web hosting account with us, login to your control panel, and use the park domain option in your control panel.
Also, make sure that the parked domain has the same nameservers as the main domain name