How to config reverse_dns in bind package~!

[nexuscrypto]

Hi everyone,

I need a little help. I'm just noob in DNS role. I just want to learn how to config reverse_dns in bind server. I successfully forward mode.
But when I try nslookup there is one error showing..

Default Server : Unknown
Address : 192.168.1.1

I just want to make showing other than unknown to my pfsense hostname.  Sorry for my bad English.

Regards!