Depending on what router yours is, you'll probably have to type in 192.168.1.1 into your address bar, which should take you to the router settings page. You'll probably have to log in : most Netgear routers have a username of "admin" and password of "pass" as standard (sometimes it's "user")

After that it's very easy to navigate around and change things - but if you don't know what you are changing, don't change it!!!!