3G is mobile broadband. There is no router. You have something sticking out of the side of the computer, which looks like this:
http://technical-itch.co.uk/wp-content/uploads /2008/04/3-broadband-dongle-laptop.jpg
Check again who your Internet Service Provider is.
If you have home broadband and a router, and you want help configuring the router, please tell us which router you have.
However, you usually access the router settings by going to this address in your web browser:
http://192.168.1.1/