You don't need to do anything with registrar's nameservers. What you are seeing in that column when in your domain account has no instructions so they are not telling you to do anything with their nameservers. Nothing whatsoever. All you need to do with nameservers is use it to point your domain to your hosting, not the other way around and certainly not both ways like you seem to continue to believe you need to do. That's not how it works, and we've already explained that. As stpvoice said "We can't point an account at your registrar, the registrar needs to point the domain at us." Nameservers point a domain somewhere, so there's only one place to place your nameservers and that's in your domain account, not your hosting account.
The only thing else you need to do is to put your domain in your hosting account. You can still just go to your hosting account panel and change your hosting main domain to your new domain if you want to. Or you could unsuspend yourself for inactivity if you still want to use your hosting account then go to your cPanel and add it to your addon domain or parked domain. You can only place it in one of the three options: main domain, addon domain, and parked domain.
If you still are having problems with your new domain after following these instructions and explanations, then contact your domain registrar's support for help as we've already now told what you needed to know about it and what to do. It just might be a problem on their end that needs solving.
Edit: I've gone ahead and unsuspended you as this seems to be a small part of the problem you are having. I see that you've already put in a domain name change to your account. It's taking longer than usual for the changes to complete, so let's just see what happens when it's done.
