Are you connecting your PC via ethernet or wifi? If by ethernet, connect an ethernet cable from your pc to the router, power up your router and wait for all lights to go green. You should then be connected and a square symbol should be visible in the task bar at the bottom right of your screen.
If you want wifi = click start button bottom lef, choose settings, click the network and internet symbol. Windows will then find all available wifi connections - click on the one that relates to your router - click on connect - put in the password (may be called network security key by windows 10) that should be on the router and you should be connected.
There may be a shortcut to this if your taskbar, bottom right, shows a wifi symbol. If so you could simply right click on it and available wireless networks will be displayed, click on connect, enter password, and you should be connected.