Step 1: To return to the home screen, tap and then double-tap the Android Home button.
Step 2: On the home screen, move the focus to the Settings button and double-tap.
Step 3: Move down the screen to the System area until you hear “Accessibility,” and double-tap.
Step 4: On the Accessibility screen, move the focus to TalkBack. You hear “TalkBack, On.” Double-tap.
Step 5: Move to the On/Off switch, and double-tap. You hear “Alert, Stop TalkBack.”
Step 6: Move to the OK button, and double-tap.