I have a Samsung UE40ES7000 HDTV 3d smart TV, (bought in 2012) with three HDMI ports which are all in use (V6 box, sound bar, and DVD player). I want to also use an Amazon firestick and think, but not sure, that what I need is an HDMI switcher. I've got the manual for the TV but frankly don't understand it. Can anyone suggest what is the best option? Thanks in advance!