Where is the side button?

[nesss22]

No seriously tell me where?

[Robin621k]

The bottom button on the right side of your phone is the Side Key/ Power key.

[LongHiker]

@nesss22 On the side of your device is two buttons. The longer one is the volume up/down. The shorter one is called the side key. 

On Samsung phones generally the side key is below the volume up/down key.

On Samsung tablets generally the side key is above the volume up/down key. 

[LongHiker]

What device are you using?

Some cases provide separate volume up and volume down buttons even though the device only has a single button.