How do you use a button activated vape pen?

Excuse me, could you please elaborate on how one would operate a button-activated vape pen? I'm interested in the specific steps involved, from starting to using the device. Do you need to charge it first? How do you fill it with the desired liquid? And most importantly, how do you activate the button to initiate the vaping process? Additionally, are there any safety precautions or maintenance tips that one should be aware of while using such a device?