If you prefer to hide your personal information which is visible through the public WHOIS databases, you should purchase the service called “Domain privacy (ID Protection)”. You may find it by accessing your Client area -> My Domains -> -> Addons -> Domain privacy (ID Protect).
The Domain ID Protect is a service, which allows you to hide your personal information when your domain is checked through the public WHOIS databases. In short, you will be able to hide your address, phone number, names, organization, email address.
Note that it may take some time for those WHOIS databases to get updated.