Make sure that your router is plugged into the wall, and that an ethernet cable is attached from the router to a computer and another from the router to a modem. Open up either Firefox or Internet Explorer. Direct your web browser to either http://192.168.0.1/ or http://192.168.1.1/, it depends on what address your router responds to. You will be asked to put in a username and password. The username is “Admin” and the password should be blank. From there look for a “wizard” or “easy setup,” something to guide you through the process. There may be more than one, so look. Make sure that the wizard asked you to set a new admin password, a time zone, a name for your wireless network, and what kind of security should be used on the wireless network (I recommend WPA).
Connect a computer to the wireless network. You will have to enter a long string of letters and numbers if you used WPA security, usually called a “Pre-Shared Key.” Done.
If any step here doesn’t work contact your router manufacturer.