problem setting up a name server, help plezzz

i tried to setup my own nameserver, but somehow I got

66.90.**.** NS1.XSTREAM1.NET
66.90.**.** NS2.XSTREAM1.NET

and i can't remove that from the system, how to remove that 2 thing because everytime i tried to removed it i got this error message :

Sorry, the nameserver ip 66.90.**.** cannot be removing since it is still registered with an ICANN register.

and I dont know what the h*** is XSTREAM1.NET



and one more question, what's Reverse DNS (notify your datacenter to setup reverse dns for the IP addresses used)
I dont know what it means...

 

 

 

 

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