You need to go to co.cc and register your domain for free. Co.cc is a third-party domain that x10hosting doesn't own nor control, yet there is an option to choose that as your domain. After you register your co.cc domain, set the nameservers there to ns1.x10hosting.com and ns2.x10hosting.com It may take a few hours for the domain to propagate. Flush your computer's dns and clear your browser's cache before checking to see if it works online.