Select new (plus (+) symbol located at the bottom of the display).
From the To field, enter a 10-digit mobile number. Alternately, enter a contact name. As the name is entered, a matching contact may appear and can be selected at any time. Alternately, select the plus (+) symbol (located in the upper-right), select a contact then select the appropriate mobile number (if applicable). Repeat this step as necessary to add additional recipients.