Whenever I try to log in to Stealth CORE with my CK account, I get a message that says "Not authorized to use this program." I know for sure that I used the right login information and I've even tried resetting my password. I'm not really sure what to do next.
As Michelle said, your rank is not high enough. You need either clraik rank (50 posts and 6 days registered) or clraik VIP, which you can buy here. (you need an account to see links)