You need to find an HDMI port on the tv labeled ARC - “Audio Return Channel.” That is the HDMI input you want to plug the HDMI cable into. On the receiver, you need to do the same. Look to see if Your receiver has an HDMI output that says ARC. NOT ALL RECEIVERS HAVE ONE, so you’ll have to check the manual or look online. Older receivers probably won’t have one, but if your receiver supports 4K (again, newer receivers with HDMI 2.0 or later only), it probably does support it. The HDMI cable may also need to be 2.0 or later.
Alternatively, if your tv has component audio or optical audio out, you can use that to send audio back to the receiver.
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Denon AVR-X4300H, 5.1 KEF Q100's w/Q200C center, SVS PB1000 on the way. 50" Panasonic Plasma (3D), Xbox One
Previous build - Onkyo HT-S6800 7.1 w/ Infinity Primus P262 towers & PC351 Center, BIC America V1220 sub & 52" Sony XBR LCD