To setup a parked domain, first set the nameserver for the domain you wish to park to :
primary nameserver : ns1.blankserver.com
secondary nameserver : ns2.blankserver.com
When the domain has resolved to our server (generally takes about 24-48 hours for the ISPs to completely pickup the change), you can then login to your hosting account control panel and choose "parked domains" option to park the domain onto your master domain.