You have a male connector on one side of the switch and a male and female connector on the other end of the switch.

The end with ONLY the male connector gets plugged into the receiver.

The end with the male AND female connector.
The female connector gets connected to the battery. The male connector is used for charging the battery and only works when the switch is in the off position. The connector for charging the battery can be left loose or can be mounted in a switch/charging jack connector.
This is what a switch/charging jack connector looks like:
http://www2.towerhobbies.com/cgi-bin...=++&search3=Go

This is a disassembled view showing all the parts. They are easy to assemble and do include instructions on how to do it. Personally, I like the convenience and neatness of the switch/charging jack connectors.