having trouble with tuning a 2nd car, and getting a 2nd reciever to work separately, been through the instruction book a few times, and can not seem to work it out

any help would be appreciated

You change the radio to a diff model in the memory and set it up like you did the 1st one. The transmit mode may need to be charged, I don't know what rcvr you're using or what the tx defaults to on a new model.