If your model has the controls reversed (e.x. When the throttle is applied the steering functions, and when the steering is applied the throttle functions) it can easily be  fixed by following these simple steps listed below. 

1. Locate your RC model.

2. Locate your RC models receiver.

3. Once the Receiver is located, have a look at the 2 plugs which are connected onto the receiver.

4. Simply swap the connectors with each other.

5. Locate your transmitter & test your functionality.