If you are behind a Router, you will need to give everyone the Public IP address of the Router, and configure Port Forwarding on your Router so that incoming connections to Port 2537 are directed to your Server. For example, if you Server's internal IP is 192.168.1.2 and your Router's external IP is 25.14.99.134 then you give players the 25.x.x.x address and on the Router, you configure incoming requests to Port 2537 to be redirected to the 192.x.x.x address. Google or check your Router's documentation for more details.
 
Also, if you have multiple computers behind your NAT, it may be wise to static the internal IP of the machine you have the server running on.

If for some reason you have an extended power outage (longer than your DHCP lease duration) your machine may grab a different (internal) IP Address and the port forwarding statements will be pointed at the wrong box. You can also change the lease duration, but a static address is really the best solution for a server.
 
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