Tap the Settings icon.
If this is the first time enabling TalkBack, you will be taken to a TalkBack tutorial.
If this is not the first time, you will be taken back to the TalkBack settings screen.
Tap the Home key to highlight, then double tap to exit the screen you are on.
Note: When TalkBack is enabled, basic device navigation is altered. You must swipe with two fingers instead of one to navigate. To select items, you must tap an item once to highlight and read aloud the name of the item, then you must double tap on the screen to select it.