How to double control to single control?

1, ready to ordinary switch, wiring screw accessories, electric pen (screwdriver).

2, the switch screws removed, removed and the same as the figure.

3, then look at the front picture this is the point of punching, positioning, punching, screws.

4, simply look at the dotted line connection diagram, you can start assembling.

5, then look at the inside picture of the look, positioning, punching, screws. Accessories installation is complete.

6, finally look at the wiring diagram to this is completed.