|I'm assuming that this is a store bought router. Most routers will apply to the following directions.|
1. You need to obtain the ip address of the router. Do so by going to command prompt, and typing ipconfig. The address of the router is the Default Gateway. Usually, this is 192.168.1.1
2. Go to your internet browser, and type the number into the address bar using this format: http://192.168.1.1
3. You should now be able to configure the router. To set a password, look for "wireless", or "security".