Using this switch is easy. First, make sure the power is turned off before installation. Locate the appropriate place for the switch and cut out a hole according to the given size of 33mm X 22mm. Then, attach the switch using the 6.4mm spade terminals. Once installed, turn the power back on, and you can start using it. As for maintenance, keep the rubber cover clean to ensure its splash - proof function. Check the connections regularly to make sure they are tight. If you notice any issues like flickering light or loose connections, turn off the power immediately and contact us. And remember, this switch is rated for 250VAC and 20Amp, so don't overload it with higher power appliances.