No need to reverse the radio. You reverse the channel that is operating in the wrong direction via the gyro unit itself. You Hold the little button on the front of the gyro ( after it is switched on ) The unit flashes and then a dim green light will come on next to the first aileron channel. release the button. If you are happy with the direction of that channel then you need to press and hold the button down again until the light moves up to the next channel. Or if you want to reverse it just give the button a short quick press and the light will turn red to indicate you have reversed the gyro direction on that channel. Basically do the hold and press thing till the dim light gets to one of the elv channels. Reverse that and all should be set.
Regards Al