To use co.cc domain first of all register it. Once registered it then change the domain name servers to
ns1.x10hosting.com
ns2.x10hosting.com
And allow to propagate (it may take 24 to 48 hours)
Right now ekramy.co.cc is avialable in co .cc
Means while
Goto account panel and change the domain to subdomain and select one available subdomain. Then you can access cpanel.