U need the android device or chrome to control it.
You could get a chrome cast. Its $35 and just plugs into the hdmi slot in the tv. Its the size of a usb. It pretty much turns ur tv into a smart tv. You will need to use an android device or download chrome on a computer. Your computer would still be usable you just would want to open another window on ur computer if you are using the internet.
Jessica, I dont have a roku but you could always invest in a ps3 or wii, u can play games and sream netflix. Maybe somrone here will have one that knows.
I did plenty of times but i cant get answers for those specific questions :/
Try GOOGLING your question...