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Logitech harmony 350: https://www.amazon.com/Logitech-Universal-Entertainment-Certified-Refurbished/dp/B00Y34TAA0/ref=sr_1_10?s=audio-video-accessories&ie=UTF8&qid=1472591827&sr=1-10&keywords=logitech+harmony I have used it personally, it is great, and can support up to 8 devices

You could try using an RCA cable instead

If the adapter was active, as it needs to convert analog signal to digital signal. The adapter will not look like a cable with a 3.5mm port on one end, and an optical on the other, instead it will look like a box, with the corresponding ports in it.

The TV may not support RCA audio output then, as it would have been much easier to configure. If your friend's speaker only supports 3.5mm input then the only option would be purchasing an active adapter to convert the Analog signal from the RCA or 3.5mm to a digital signal such as HDMI.

What options are given when you enter this menu: "MENU > Sound > Speaker Settings > TV Sound Output"?

The RCA Cables may be plugged in the wrong place, like in the RCA input plug. You're going to want to plug the red and white RCA plugs into a plug labeled output instead of input, then configure for external speakers in the settings

You need to configure your TV to output sound to your AMP, as if your TV is outputting sound, then it is configured to the internal speakers of your TV. I tried looking at the TV's instruction manual, although it seemed to be in Italian. Looking at the pictures, I didn't seem to find an optical...