Follow the below steps to take screenshot on iPhone 6S
Screenshot on iPhone 6S
On your device, know the location of Power/Wake Up button and also the Home button.
Hold your iPhone 6S with both of you hands.
Now put your right hand’s index finger on Power button [don’t press it] and left hand finger’s thumb should be pointing to Home button.
To take screenshot successfully you should press the combination of Power button and Home button together for atleast 3 seconds.
If the screenshot is successful, then you will hear click sound and also flashy notification animation will appear on your device.
To access the screenshot on your iPhone go to Photos > All Phones.