Adding glue records to my registrar

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http://serverfault.com – I have a country specific domain (let say example.me) and when I try to add my own nameserver (ns1.example.me & ns2.example.me) at my country registrar it didn't worked because I only have 1 IPv4 IP and that registrar control panel didn't accept same IP for both different nameserver. My vps have it's own dns service and dns control panel because I want to make changes at my vps. Adding resources records and so on. So how to solve my problem without forking another 1-2 dollar to buy extra IP? I'm thinking about signing up with free dns service provider but isn't when I do that I can only a (HowTos)