Add or remove people to start a new group message

You can't change the people in an existing chat. But, you can start a new message and add or remove people from the previous chat.

1. Open the Chat app  or Gmail app .
2. Select an existing group conversation.
3. At the top, next to the conversation name, tap the Right arrowStart a new chat. 
4. Add or remove people from the existing group:
   • To add people, enter their names or under Frequent, tap a suggestion.
   • To remove people, tap their name and then Delete.
5. Tap Done  .