Not building a wireless keyboard? Skip ahead to the Reset Buttons.
The power switch allows you to fully disconnect the battery from the microcontroller, reducing idle power consumption.
You only need to do this if you are using a wireless controller and have purchased the Wireless Controller Expansion Bundle.
Face the PCB with the power switch footprint toward you: on most keyboards it will be on the bottom, but some keyboards will have it on the top. Solder some tin on one of the pads of the switch footprint. You won’t need much solder, as the pads are relatively small
Grab the switch using tweezers in one hand, and use your soldering iron with your other hand. Move the switch in place, and heat up the solder until it melts.
Then, move the switch in place, touching both the switch leg and the pad with your soldering iron until you notice a solder joint form — this usually only takes a second or two.
Remove the soldering iron, wait until the solder joint solidifies. Then release the tweezers.
Solder the other joint. This one should go a lot easier as the first one is already holding the switch in place, so you don't need to use tweezers anymore.
Don't worry about shorting the two pins closest to each other on the back - they are intended to be connected.
Repeat for the other half.
The switch is turned off when it is placed towards the side with two pins on the back, and turned on when placed towards the single pin.
If you don’t want to use a power button, you can bridge the pads pads on the back using solder. You could use a small piece of wire or a diode leg to help you bridge them.