To join a chat, you need to be invited, and to have others join your chats, you need to invite them.
To invite someone:
- Click the person icon at the top of the chat window ().
- In the field labeled 'Add people to this chat,' enter the names of the contacts you want to add to your group chat.
You can only add contacts who are currently online. There's no limit to the number of participants in a group chat, and any participant can invite others to the chat. When a new participant joins the chat, you'll see a message stating 'Contact Name joined the chat' in the group chat window.