Power on the first router

Can u hook up 2 routers

This run network work the cable tv wires. It is easier to start out with the default settings for the router so you can follow the steps to set it up in the router's documentation. Power on the first router. Exactly how you cable it varies a bit but you would connect one to the tv coax with a splinter near the modem and a second in the other room.

You may want to look into

Attach the coaxial cable coming into the building, which provides Internet access, to your cable modem's coaxial connector. Reset the router by pressing and holding the reset button with a paper clip for thirty seconds.

Attach the power adapter to the modem and turn it on. Reset the second router as you did previously with the first one by pressing and holding the reset button for thirty seconds.

Using a network with two routers

You may want to look into a wireless repeater or running a network cable outside of the house, or having an electrician pull a cable for you. Using a network with two routers makes sense in a small business when you run out of ports on a first router to connect computers or devices to. Connect one side of an Ethernet cable to the Ethernet port on the modem. These generally work much better than powerline networks especially if you have a simple coax path to the other room. This is necessary if your modem is not already installed.

This can be found in its documentation. They are kinda expensive though compared to other solutions. Setting up the two routers is a fairly straightforward process and should only take about an hour.