1. Go to Settings-General-Accessibility-Auxiliary Touch or Auxiliary Touch, and turn on the auxiliary touch or auxiliary touch gently.
Second, tell Siri to turn on auxiliary touch, AssistiveTouch or turn on small white dots.
Third, enter Settings-General-Accessibility-Accessibility shortcut, and click Auxiliary Touch or AssistiveTouch. After turning on the auxiliary touch, you will see the auxiliary touch menu. You can drag it to any edge of the screen and then tap the menu to open it. After turning on the shortcut key of accessibility, press the Home key three times on any screen to turn on or off accessibility. To adjust the speed of pressing the Home button three times, please go to Settings-General-Accessibility -Home button and select the click speed as needed.