Without model numbers we can't give you an exact answer.
If both the TV and receiver have ARC and you used the ARC input on the TV then you would have to activate ARC in the TV menu to get it working.
If they don't both have ARC then you would use whatever audio output the TV has, optical is the most common. to get audio to the receiver. Check the receiver manual for how to set up the inputs.
The manual is your friend even if finding info is a pain.