How to connect wires between power supply and switch?
This is basically what you want to end up with:







simulate this circuit &ndash; Schematic created using CircuitLab

In your image, you would take a short wire from L on the back of the plug to the "I" (or "O") on the switch, then from the other side of the switch to "L" on the power supply. The remaining N and G wires run straight through.

E (Earth) == G (Ground) 
N = Neutral 
L = Line