Hi. My name is***** you for your question and the opportunity to assist.
Can you tell me the brand and model number of your router please?
Normally this is the procedure to get things connected.
Connect the router to the modem with a network cable and use another network cable to connect a PC or laptop
to the router. Unplug both the router and the modem but leave them connected with the cable and shut down the PC.
Plug in your modem only and wait until all it's lights come up and indicate it is fully operational.
Then plug in your router and wait 2 minutes to come up. Some routers are smart enough to automatically detect the internet
connection from the modem and after a few minutes the internet light on the router will come on indicating it has an internet connection.
If that happens, good for you. If not, start up the computer. It will automatically get an IP address from the router but won't have an internet connection but you can connect from computer-to-router to set the internet connection
type on the router. If can tell you how to access the router If I know the brand and model number.