Welcome to the forum!
Let me ask, which model of TV do you have? That can help us look things up about it.
If the TV has left/right audio out jacks, you can connect those to a set of left/right audio in jacks on the receiver (you've probably already done that). Now, a lot of TVs will need to have their internal speakers shut off before they will output sound through those jacks. So, try going into the menu and turning off the speakers. There might also be an external switch on the TV for shutting off the speakers.
Also, some TVs have headphone jacks that can be used. You can get an inexpensive cable that will plug into the headphone jack on one end and have two RCA jacks to plug into the left/right inputs on the receiver on the other end. If you need something like that, let us know and we can point you towards a good cable.
Adam