On the wifi router, is the WLAN light on?
If not, press the WLAN button on the side of the router. The WLAN light should come on.
Can you see the wifi network on your phone/tablet? Do they connect and access the internet?
Did the computer use wifi before or was it cabled? Is it a laptop? Desktop computers don't usually have wifi.
If it was cabled, the wireless might not be enabled.
In Windows, you have to enable the wireless adapter and turn wifi on.
Do your other wifi devices access the internet ok?
Is your computer a laptop or desktop?
If it's a desktop computer, you'll need a usb wifi adapter if you can't run a cable.
If it's a laptop, the wireless part might be disabled. I have Win7 so Win10 may be different.
Open a command window and do this command:
netsh wlan show networks
This displays a list of networks like you see on your phone:
SSID 1 : NETGEAR80
Network type : Infrastructure
Authentication : WPA2-Personal
Encryption : CCMP
If you don't see a list, the wifi is not active on the computer.
This functionality is also in Control Panel/Network and Sharing Centre, whatever that is in Win10.