Okay, I would just leave the jumper set for 4.8V, to start. That's the voltage that it's sending to your glow plug. They recommend not going over 6V, so I'm not sure why they include even higher voltages.
You'll plug it into your receiver. Are you using Spektrum, Futaba, or something else? Basically, you want to plug it into an unused channel. The radio system you're using will determine what channel to plug it into and what switch it will be. For Futaba, you can plug it into any of the unused channels and just assign that channel to whatever switch you want. For Spektrum, you'll need to plug it into an unused channel and then use the switch that corresponds to that channel. Hope this at least gets you started.