Mobile:
- Go to Messages tab
- Select Message to add User(s)
- Click on the group message name at top of your screen
- Click Add Participants
- Select User(s) to add to Group Message
- Click Done in top right corner
Web:
1. Go to Messages tab
2. Select Message to add User(s)
3. Click 3 dots (⋮) in top right corner
4. Click See Conversation Information
5. Click Add Participants
6. Select User(s) to add to Group Message
7. Click Save