I'm not Jim, but I can elaborate a bit since I have 2 Fire Sticks. First, your H3 needs to be connected to your home internet router. Second, the Fire Stick(s) need to be connected to the same network as the H3. Third, you download the Dish Anywhere app on the Fire Stick itself. Then, you use the Fire Stick remote to access the guide, DVR recordings etc.
The Fire Stick plugs into an empty HDMI port on your TV. I do not suggest using the TV's USB port to power it. Use the included adapter and charging wire that comes with the Fire Stick.