1. Send messages to a group (iMessage and MMS):
   
   Tap the compose icon.
   
2. Enter multiple recipients.
   
3. Group messaging settings:
   
   From the Home screen, Go to Settings.
   Note: With MMS, group messaging must also be turned on in Settings > Messages, and replies are sent only to you, they aren't copied to the other people in the group.
   
4. Tap Messages.
   
5. Tap the Group Messaging toggle to turn on or off.
   
6. Leave a group message: If the group message is using iMessage and has more than three participants, you can leave the conversation. Tap Details.
   
7. Tap Leave this Conversation.
   Note: Leave this Conversation might not be available if there are only three people in the group iMessage or if the group message uses MMS.