The nameservers are:
ns1.x10hosting.com
ns2.x10hosting.com
Could you clarify what your domain registrar needs in order to set the nameservers if this doesn't work?
I've heard of some domain registrars needing the domain name added to the hosting account in order to verify the dns settings from the hosting's end. Have you tried changing your main domain or parking your domain name in your hosting account? I don't see it listed anywhere for your account yet.