I cant figure out how to listen to the radio while i play video games through hdmi cables

In order for you to be able to have a different audio source from your video, i.e.; have "radio sound" instead of "video game sound", you have to connect your HDMI cables from the game console directly to the TV/Monitor.

The reason for this is that video and audio are carried simultaneously over a single connection on HDMI. If you make your HDMI connections through a receiver to a monitor, whenever you change your input to the radio you also lose your video game picture.

So to summarize;

Power off your receiver and game console.

Disconnect your game console HDMI cable from the receiver.

Reconnect the HDMI cable to the TV.

Turn on the TV, then the receiver, then your game console. Then change your receiver input to the radio.