For ARC to work you need ARC in both the TV and the receiver. You have to connect the receiver HDMI out to the HDMI input of the TV labeled ARC and activate the function in the TV and maybe the receiver. Did not see mention of ARC in the receiver manual so you may have to use the optical out.
If the TV doesn't have any other output that ARC then an HDMI audio extractor like this one will work
http
/www.amazon.com/ViewHD-Extractor-Support-Converter-VHD-H2HARC/dp/B00LKF6CPG