Create and Send a Text Message - The all new HTC One® (M8)
From a Home screen, tap Apps (located at the bottom).
Tap Messages. If unavailable, tap the Dropdown menu (located in the upper left) then tap Alphabetical. If still unavailable, refer to Manage App Icons.
Tap the Compose icon + (located in the upper right).
From the To: field, enter the 10-digit wireless phone number or email address. As the number is entered, a matching contact may appear and can be selected at any time. Repeat this step as necessary to add additional recipients.
From the Add text field, enter the message then tap the Send icon (located in the lower right).