ROUTER CONFIGURATION::
Download the manual if you don't have one. You'll have to do a Internet search for your specific model and include the terms "manual" or "setup" in your search.
Connect a PC or laptop via Ethernet to one of the router's LAN ports and follow the instructions in the manual to set it up.
You can set up a router via a WiFi connection assuming you have the administrative login password.
I would not recommend this, if you lose the WiFi connection while you are in the process of configuration, it may be impossible to reestablish the WiFi connection without resetting the router. The best way to configure a router is via a direct Ethernet connection.
The wireless network name (SSID) and password used for wireless security (encryption) and are not the same as the administrative username and password used to log in and configure the router.
Passwords in the router user manual or printed on the back or underside of wireless routers are the factory defaults. For security these passwords are changed (or should have been changed) when the router is first configured.
If you don't know the login password you'll have to reset the router to factory default state. The instructions will be in the manual.
If the router is reset to factory default, thus erasing all user modified settings then it will revert to the default passwords. Be sure to change the password of the administrative interface of your router from the factory default for security.
Wireless connections also require security configuration to prevent anyone with a WiFi in range of your router from connecting to your network. They could do malicious deeds, such as hack into your network, or just leech off of your Internet bandwidth which can slow your Internet connection to a crawl.
Wireless SSID (WiFi Name), password and security type are configured in the wireless settings.
Wireless setup is not too difficult, Just follow the instructions in the router manual or wizard set up program. If you're having problems either pay someone to set it up for you or find a knowledgeable friend to configure it. Once the wireless network settings are configured it's a fairly trouble-free system.
Once it's setup you can disconnect the Ethernet cable and use the wireless connection.
Good Luck...