You can send private message to other users, Move your mouse cursor to any user whom you want to send private message and click left mouse button. A menu will be appeared, click on " Private message".
After that you will get a window with name of that user, than you can send messages. You can add smiley too like as main chat room. You will find some options in top left corner of this private message window
1st icon " Write answer" - You can use this option for reply.
2nd icon " Information about user" - after click this, you will get information about user.
3rd icon " See photo" - You can check user photo after click this icon (If user have not picture in profile, than you will not get this option in his/her private message window).
4th icon " Add user to…" - After click this option, you can add user in your contact book and also you can add him/her in your Black list (Ignore list).
5th icon " History of last messages" - Here you can check last 20 messages chat between you and him/her.