Just plug it into the phone then plug in the ac adapter (it needs power) and connect the HDMI cable from adapter to tv and BOOM, a mini power computer. I have a bluetooth mouse and keyboard paired to the phone and it works great. The only thing it would make it perfect is if I can stream the optimum tv app. unfortunately the optimum tv app can detect if you are using an "external" display and it won't show the video on the tv. But you can stream watchespn, hbo go, max go and pretty much any other apps onto the big screen.
I tried to ask if anyone can hack the optimum app to allow it to be used with external display but no one replied.