Does this help?
The red plug with the two wires is the battery lead - the pic shows where it goes.
The two black plugs with three wires each are for the servos. Most receivers have the centre socket for the steering servo and the end one for the throttle servo, so identify the wire that leads to the rudder servo, plug it in the middle socket, and see if the rudder responds the way it should. If it does, plug the last remaining lead in the last remaining socket, and you are good to go.
However if the rudder moves when you move the throttle control on the transmitter, move the rudder servo lead to the last socket, and plug the throttle servo into the middle one.
