Create and Send a Text Message - Microsoft Lumia 735
From the Start screen, swipe left to display the apps list.
Alternatively, tap All apps (located in the lower-right, may require scrolling).
Tap New message (located at the bottom).
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, tap the Plus symbol (located in the upper-right), tap a contact then tap the appropriate mobile number (if applicable).
Repeat this step as necessary to add additional recipients.
From the "type a message" field, enter a message.
Tap the Attach icon (located in the middle-left) to add an attachment (e.g., Photo or video, Voice note etc.).