Set your DNS at co.cc to
ns1.x10hosting.com
ns2.x10hosting.com
Then you can do one of two things.
1. If you want the co.cc to be your main domain, log on to the
Account Management System with your Forum username and password ,
Top menu, HOSTING --> modify domain
uncheck the
Use an x10Hosting subdomain as my account's main domain box,
Fill in your whateverthedomainnameis.co.cc
It should take a little while for the system to absorb the change.
2. If you want to retain your pcriot.com domain name on the account, you can go to cPanel
Domains --> Parked Domain
and add the co.cc domain. This way both domains will point to the exact same content.
Or, you could do #1 and then add the pcriot.com domain back on as a parked domain.