A:AnswerYou can use the TV without an account but with a limited but essential number of apps. Create an account for free for full Amazon functionality.
A:AnswerThe YouTube TV app is now available for the Fire TV Edition television.
To see the list of supported devices, please visit: https://tv.youtube.com/welcome/
David M. - Insignia Support
A:AnswerIt normally powers up to the last input used. I use HDMI 1 and most of the time it will start up with that input. Rare instances I've gotten the home screen for some reason. I don't think there is a way to change the default though.