Do you see:

Firewall, NAT, Virtual server or similar anywhere in the options ?

If you aren't sure sure about something then take a screen shot and attach it here.

BTW you should set up a static IP as well. You can find instructions on how to do that at www.portforward.com

Here are some examples of what it can look like. (Taken from my router). Your will probably not look like this. This is more to get the general idea of what to expect.

UPnP
Attachment 2948

NAT Options (Do not use DMZ. It will leave your system vulnerable to attack)
Attachment 2949

Virtual Server Setup
Attachment 2950