Firewall/NAT

Hi, everyone.
I'm just a newbee in m0n0, so sorry for the stupid question)
 
I have a m0n0 with a internet ip addres at WAN int, and server
 in lan network (192.168.2.1 for ex).  
 I need to provide users from internet to server (by port 1510)
 inside lan through m0n0.

What should i do for that?

I tried to make a new rule Firewall: NAT: Inbound

Interface     WAN

External address    int. adress

Protocol   tcp    

External port range    
from:      1
to:    65535

NAT IP    192.168.2.1

Local port    1510

But it still isn't working...