Turn your phone on, and start exploring it.
The pictures are examples from Lumia 950. In Lumia 950 XL, the power key is located between the volume keys.
Press the power key until the phone vibrates.
Turn the phone off
Press and hold the power key, and drag the lock screen down.
Article ID: 10518 - Last Review: 17 May 2016 - Revision: 15