To add a participant to a chat, perform the following steps:
- Within a chat, tap the "Chat menu" button (on the upper right corner of the screen, three lines or squares).
- Tap "Add someone to this chat."
- Select friend you want to add.
- Go to your Chat List > Select Chat to which you want to add people > Tap the Chat Settings Button (in the upper right corner) > Select members > Add > Choose the contact you wish to add > Select Add Members