I have to agree with @bob - the easiest way for you to enjoy streamed video in the bedroom is with a Fire Stick. It is an extra purchase but it will make watching all your prime stuff upstairs really easy.
NOTE: If you house has huge steel girders or when you use your device in the bedroom it frequently says "internet unavailable" then you have too many walls and things between your router and your room - give up :(
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Even if you have a Smart TV, an "upgrade" from the manufaturer can often remove support for some of the apps (yes, Samsung and Panasonic, I'm looking at you).
If you have trouble with your wifi signal, you can use a wifi extender or a Powerline Network (if your wiring is up to it), or even run an ethernet cable from your router to a wifi extender (or buy a Fire TV and run an ethernet cable to that)