Go to Web administration http://www.<yourdomain>/admin on the
hosting service, or to
Login with your web admin account.
Click the menu button on left for Domains | List Websites
the existing web site's domain (e.g. mydomain.com) and click the button on
the right for Properties.
Click Host Headers button on right.
In pop up window, typed www and the new domain (e.g myaliasdomain.com) and
click Add. Again in pop up window, left blank field and type
and click Add.
Close the pop up.
Click menu button on left for DNS Manager | List Zones.
See that the new domain is listed and points to the same IP as the
You will of course, depending on how you
registered the new domain name, you will either want to get your
domain registrar to point to our DNS
or else change edit the
'zone' files of an existing DNS server to
point the new domain (with and without www hostname)
to the IP number of the new site.