During playback of a YouTube video, how do I "subscribe" to that YouTube channel on ATV3 or ATV4? I had no idea how to do it on ATV3. I was trying ATV4(which I later returned) last week, I mistakenly thought that it was possible to do it on the ATV4. I decided to give the ATV4 another try, so I bought another ATV4 this afternoon. I just had it set up and apparently it's also not possible to "subscribe" to a YouTube channel on the ATV4's YouTube app. However, it is possible to "unsubscribe" for an existing channel that I already subscribe. If anyone knows how to do this, please let me know.... Thanks!!!