How To Add Group iMessages

1. Tap the group iMessage that you want to add someone to.
2. Tap the top of the message thread.
3. Tap the Info button , then tap Add Contact 
   
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4. Type the contact information for the person you want to add, then tap Done.

1. Tap the group iMessage that has the contact you want to remove.
2. Tap the top of the message thread.
3. Tap the Info button , then swipe left over the name of the person you want to remove.
4. Tap Remove, then tap Done.

Note that you can only remove someone from a group iMessage if there are already three or more people in the group.

Anyone in a group iMessage can add or remove someone from the conversation.