A Roku needs to be set up on a TV that is really close to your wireless router. If it is close to signal it should just come on and it may require a password.
Amazon and Apple will set up on an extended network away from the router but the Roku is really picky about being by the original source. Once set up, it can then moved to a TV farther away if desired.
I have a Roku 2 XS. It is one of the few that has a wired network connection. All my streaming is done via a hardwired connection. Works great.