You'll need to run a cable out from the television to your receiver. That way, no matter what you've got up on your TV screen from your plugins comes out from the TV into the receiver for your surround sound.
Look on the back (or side, depending on your model) of your television. You should see a round 3.5mm plugin that looks like it's for headphones...
OR you may see a slightly squareish port with a flap on it. That's your digital optical audio port.
Either one will work you'll just need a digital optical audio cable or a standard audio cable. Run one of those to your receiver input and you'll be good to go.
You may have to go into the menu on your TV remote to set the sound to go through "external speakers" instead of the TV speakers.
Hope that helps!