I'd say your receiver is no good. You can change it with a better transmitterhttps://www.horizonhobby.com/product/cars-and-trucks/spektrum-brand/surface-transmitters/dx2e-2ch-dsmr-radio-with-sr310-spm2335
This is just a inexpensive one but if you have more than one I would spend a little...
Channel one is for steering channel 2 is for throttle. Unless it's a Traxxas and you have 2 steering channels. but they are both Mark Channel One and throttle is channel 2. The black wire on the three wire bundle is the ground wire and it will go to the outside of the receiver. Make sure black...