1. Scroll down with 2 fingers, not the normal one finger.
2. Next tap the "Settings" icon, again with 2 fingers.
3. Go to "Accessibility" and tap it also with 2 fingers.
4. Now tap the "TalkBack" icon with two fingers. You may have to tap it that way twice. Depends on if the first time registers it correctly.
You should now have it turned off.