To use the Messaging features, open the Messaging app, tap the information box (at the top of the screen) to set it as your default messaging app, then tap OK.
Tap the New message icon (at the top right of the screen) to start a new text or multimedia message.
Tap here to create a new message.
Tap an existing message thread to open it.
Pinch in (or spread apart) on your list of messages to resize it for easier viewing or navigation.