It's not always 192.168.1.1. Try varying the last number if it doesn't work.

Go to the router in your browser. The default password is admin, the user should be blank. This could be changed though, if so ask your network administrator.

Go to Advanced, then Forwarding. Enter your computer's network IP address into the IP Address column and 10052-10054 in the ports.

The first post will work but it is unsafe. It leaves your computer very open to attacks.