Can't change domain/"remove" subdomain

[zenstarstudio90]

I've been trying to find the best webhost so I've been playing around with my co.cc's domain setting. I tried this webhost then made a subdomain forums.zenstarstudio.co.cc. Then I changed it to zenstarstudio.pcriot while I tried some others. I decided this was the best one so I wanted to change it back to zenstarstudio.co.cc. The thing is when I tried to it said "The domain you have supplied is currently in use". But when I tried to connect to my website it didn't exist. I tried to remove my subdomain and see if that was the problem and I did via cPanel but it still says that forums.zenstarstudio.co.cc in subdomains when at x10hosting.com/control

OK
Well basically I want to change my domain back to zenstarstudio.co.cc
I know one thing, is that it's properly set to
ns1.x10hosting.com
ns2.x10hosting.com

EDIT:
Ok It's working now you may remove this thread.