On the Messaging screen, tap the New message icon in the upper right corner of the screen.
Add the recipients.
Select how the message will be sent, by Group Conversation or Individual Messages.
Tap the Group Conversation button to allow all of the recipients to be viewed by each other so they can respond to you and the group. The message is sent as a multimedia message (MMS).
Tap the Individual Messages button so that none of the recipients can see the other recipients (similar to BCC). Each individual can only respond to your message.
Tap the Help icon to view information regarding using these buttons.
Complete the message as necessary, then tap the Send to all button.