A:AnswerYou can link your Smartphone to the YouTube app on your TV:
-Launch the YouTube app on your Fire TV Edition television.
-Go to Settings in the YouTube app.
-Select Link TV and Phone screen.
-Follow the on-screen instructions.
A:AnswerIf you need to connect an HDMI enabled device but you do not have an HDMI cable, yes you need one. If your are not planning to hook up another device to the TV, then you do not need to buy HDMI cable.