You can do this by logging into your Online Account Manager at: http://www.hostingcheck.com/billing/
Then, Click "My Services" from the Menu.
Then, Click "Domain Registrations" from the Drop Down Menu.
Then, go to the Manage / Administrate Domains and click the Click Here Button.
Then, Click on the "Manage Domain Registration" Button next to the Domain Name that you want to Manage.
Then, Click on the "Management Tools" Tab, and choose "WHOIS Contact Information".
Now you can MODIFY the REGISTRANT WHOIS CONTACT.
