Step:
Step 1: Open the iPhone and click "Settings".
Step 2: In "Settings", click "General".
Step 3: In "General", find "Auxiliary Functions" and click.
Step 4: In "Auxiliary Functions", click "assistive touch".
Step 5: In the "assistive touch" interface, click the white dot on the right side of "assistive touch".
Step 6: Small white dots can be found on the screen to complete the setting.