You can talk to other user inworld in public chat or in private message. To talk other users in public chat click on the chat window at the bottom of your screen and type a message. Once done press the Enter key or the Send button.
To talk to other users using private chat click on the user a private chat window will open. You can type your message and hit Enter key or the Send button to send the message.
If you have already added friends you can talk to them by clicking on the Friends button then click on your friend’s name. This will open the private chat window.