SuperVee 27 Reciever (Rx-100)?

I would think the ESC would plug into Channel 1 on the receiver. After you hook that up it is a process of elimination. Plug one servo into channel 2 and use the transmitter to see what function it performes. If your throttle on the transmitter is working the steering, then you need to plug that servo into channel 3 and channel 2 would be your throttle servo.