Robert,
One plug on your esc goes into the receiver. The other plug goes to the battery. You cannot mix them up as the connectors are different. Make sure the the wire alignment to the receiver matches the wire alignment of the servos (i.e. black wires on one side, red on the other as they are plugged into the receiver). The ESC will only fit the battery one way. It won't plug in any way but the correct way. The third lead from the ESC is to the motor Again, align the wires red to red and black to black. Measure back from the leading edge of the wing... I think it is 45/8" for your balance point (check the instruction) Make a mark at that point under the wing next to the fuse. By moving the wing and battery back and forth, you will eventually find the balance point (cg) by placing a finger tips next to the mark you made on each side on the underside of the wing.. The balance point can be elusive due to the different sizes and weights of the batteries. You may end up with the leading edge of the wing as far as 61/2" back from the tail end of the motor. If you err, do it in favor of a little nose heavy rather than tail heavy. Any more question, refer to this forum. Someone will help you.
Ken