Computer can't find the router

Configure your router first, by doing that you need a ethernet cable (cat 5 will do). Connect your computer to your router using ethernet cable and open internet explorer, type in the ip address of your router and press enter. After that, you will be ask for username and password, just key in your username and password (if you cant remember, reset your router and key in the default username and password of your router). Once your done, go to internet setup and you can configure everything there. Hope it helps you.