Quoted:
Another problem is that I don't have a manual. I got a fairly good deal on ebay, but no manual came.
How do you tell if the headset is on? When I hit the power button the tree on the side turns red and then flashes red for a few seconds and then goes off.
Your receiver isn't paired to the headset. Going off memory, but I think you hold the bypass button on the receiver until the top LED turns off, release it and the LED should start flashing. At that point, you turn the headset on with the power button and the light on the side of the headset and the LED on the receiver will start flashing. Once the flashing stops, they're paired.
I have a manual for mine at home, I'm working late though. I'll get the stuff you need out of it later tonight if someone doesn't beat me to it.