How to output TV audio through my speakers

TV RCA out into Rogue Line In should work. Make sure its TV RCA out and Rogue Line In. If its connected right and no signal then check your TV menu and manual to make sure RCA line out is selected. 

If none of that works then yes there is a simple HDMI to RCA adaptor you can use to go from the TV HDMI to RCA Line In on the Rogue.

If I go from HDMI to RCA what type of RCA audio cable would I need?

There is also an HDMI Audio Extractor on Amazon.It inserts between the Hdmi run to  your TV[you need another HDMI Cable] and it has RCA Outs to run to your Amp/Receiver