If you and other members are online, you can press the chat button on their profile.
How to find an online member is pressing the control panel> home button
If there are members who are online, you will see their profile online now.
Click on the profile and press the chat button. One massage will come out on his screen.
If he is interested in you, he wants to chat he will receive a chat.
If he's busy he'll ignore the live chat request with you.