RC Tanks Australia Forum

Is there a guide on how to connect a 6Ch OrangeRx to the RC5HL? I got the RC5HL unit yesterday, and I didn't touch the firmware on it. If it makes any difference, I have a DX7 radio. Also, is there any information on what the channels on the RC5HL actually mean? I know that the 5th channel is for power switch, but I have no idea what the rest are supposed to do. I have also attached a picture of what OrangeRx I have and how I connected it.
Throttle -> Ch1
Aile -> Ch2
Elev -> Ch3
Rudder -> Ch4
Gear -> Ch5

At one point the tank actually switched it on, and I was able to operate the tracks, but the controls were all screwed up. Aileron Left/Right made the tracks move foward and backwards. Now, I can't even switch on the tank anymore. The lights flash, but I can't get the engine starting sound to work.