Domain Change nameservers

Hello i have 1 domain . I want to change nameservers but i cant.

When i try this system writing;
he provided nameserver is not configured correctly, please check your configuration.

what can i do?

and i cant open ticket.

pls can you chance it

mertuyguc . com

ns1.fibudns.com

ns2.fibudns.com

You already have an open support ticket.

If you want to add further information to your existing support request, please click my support requests. Please note that sending multiple separate tickets for the same request may result in a processing delay.

But i dont have open ticket.

I open last ticket 06/08/18, 09:16 pm

I push solved but i cant open new ticket

hi.

I open ticket yesterday but i am waiting

I dont use my website. Its important for me.

Please check ticket

yes i understand but I am still waiting.
Its important for me.
Just someone check my ticket its so basic

and i ask my hosting company.

they say to me its nitrado problem. Nitrado prevents you from changig. İf nitrado want change they can change. Its my domain but i cant use it now
Please can you say ticket personel?