Add nameserver to domain

Hi guys.
I have a domain .me from namecheap and a server in digitalocean. so i want to try set up my own mail server using Mail-in-a-Box guide. But there are several problems occur when I click the status check in admin page. 1 of the problems is

Nameserver glue records are incorrect. The and nameservers must be configured at your domain name registrar as having the IP address They currently report addresses of [Not Set]/[Not Set]. It may take several hours for public DNS to update after a change.

On the guide it said to add a nameserver and into my domain. But i only can register and . Im not so sure if there is a way to add and

I hope you guys can help me. Thank you

Someone had a work-around here: