I have been unable to figure out how to set up my rear steering. The servo is on channel 3, but I can not find out how to set the radio to use the switch to change from different modes of my rear steering... off, turns in opp. direction as front, same direction as front, and rear only. Mine is not hacked yet, but the parts are on order. Been a while since I ordered, so hopefully it will be here soon.

Can anyone help?