Recievers do not have a TV tuner in them, that is why there is no coax input.
I am assuming you want to get audio from your cable to play over your receiver.
Best option is the ARC option amercianaudiophile listed.
Connect all your other devices (game consoles, computers, streaming boxes etc) to the HDMI inputs on receiver. Connect HDMI output to TV and plug it into the ARC enabled HDMI port on your TV (consult TV manual). Then you may have to go into TV settings to enable ARC (aduio return channel) and possibly into receiver settings as well.
With this setup when you use cable or use stream with built in tv apps the audio will automatically pass through HDMI back to receiver.