To learn how to use Apple's new 3D Touch feature, please watch this video.
Tap to launch Settings from your SpringBoard.
Select General from the Settings menu then Accessibility from the General menu.
Scroll down and choose 3D Touch from the Accessibility menu.
To adjust the amount of pressure needed to activate 3D Touch. Drag the slider to the left or the right. Light sensitivity reduces the amount of pressure required. Firm sensitivity increases it.
You can press the image below the slider to test 3D Touch sensitivity for Peek and Pop.
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