1) Login to your WebHostingZone account at https://www.webhostingzone.org/members/clientarea.php
2) In your account go to "Domains" >> "My Domains" and click "Manage Domain" next to domain you would like to edit
3) Go to "Management Tools" and from drop down menue choose "Register Nameservers"
4) Enter "Nameserver" name, "IP Address" and click "Save Changes".
