Your battery plugs into the switch/charge harness and the lead from the switch harness plugs into the bottom Rx port marked 7 or CH 7. Actually you can plug the power from the switch harness into any unused RX (servo) port. If you need all 7 channels then the switch plugs into a Y harnesss and the other leg the servo will plug to. Then the single lead from the Y harness is plugged into that last port marked 7b. That 'b' means battery.

John