How To Use Back Tape Feature

 If you mean the Back Tap feature on iPhone, here are the steps to set it up:

1. Go to Settings on your iPhone.
2. Scroll down and tap on "Accessibility."
3. Tap on "Touch."
4. Scroll down and tap on "Back Tap."
5. Choose either "Double Tap" or "Triple Tap" to activate Back Tap.
6. Select the action you want to perform when you double or triple tap the back of your iPhone. You can choose from a range of system actions, including taking a screenshot, accessing Control Center, opening an app, or running a Shortcut.

Once you've set up Back Tap, simply double or triple tap the back of your iPhone to perform the action you've assigned. Note that Back Tap is only available on iPhones with a A10 or later chip, including the iPhone 8 and newer models.