Connect an Ethernet Cable between the router's WAN Port and your present Modem Ethernet Port.
Connect a second Ethernet Cable between the PC's network card port and Port 1 of the Router's LAN Ports
Power on the Modem when fully booted with all lights displayed
Power on the Router when the router is fully up and running
Now launch your web browser and type the Router's IP address access code, which you will find in the manual, into the browser address bar
This will open the configuration pages to set up the router and wireless networking.
Once the router set-up is completed and you have SAVE the setting log out and close browser
Check that you can access the Internet