|Did you read the router's manual/setup guide?|
It describes how to connect it (physically) and set it up to get it working.
Every SOHO Router I've ever worked on, and I've worked on Linksys, requires you to connect a PC to a LAN port on the router. You then open a web browser and type the IP address of the router (found in the setup guide/manual) in the URL field and hit Enter.
That connects you to the management interface.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.