You need to make an entry for both TCP and UDP, and the IP is the one of the computer to which you want the packets sent.

The router itself probably has the external IP (the one issued by the ISP). The router then gives each of the computers a local IP, like 192.168.1.100.

If you can set your computer to always use one of the router-issued static IP's (like 192.168.1.150), then that's the number you want the router to use for sending packets to your computer.

See the sticky on "port forwarding"

It should do a much better job of explaining all this.