On the home screen, tap Messaging.
Note: If the shortcut has been removed from the home screen, tap the Launcher icon and tap Messaging.
Tap the desired message thread.
Tap and hold on the desired message.
In the To field, enter the contact name or ten-digit number of the recipient.
As the name and phone number are entered, matching results from the phonebook will be displayed. Tap to select the desired contact and phone number.
Edit the message if desired and tap Send.