How can I connect my TV to my Mc130

First let me say I am a novice when it comes to HT.My system consist of a MC130 pro.Oppo bdp 95 Blu-Ray player CJ five channel power amp TV LG LX 9500 custom made speakers.The Blu-Ray player as 5.1 and 7.1 output which I connect to the power amp the HDMI out to the TV works fine when I am playing multi.channel 5.1.This is my problem if there is something on TV I would like to play through my HT system I have no sound.On the back of Mc130 there is a TV RCA input from the TV to the Mc130 input Iam lost I do not know how to connect from TV to Mc130.