To start, enter you name in the bottom line above the icons with the hand and faces in the chatbox, and press the ENTER key. Sometimes the name you enter is in use, so try again with another name.

If your name is accepted, you will see a text first saying, "Logging in", and then you will see on top in the chatbox "Login OK"

If you want to say something, then also enter your sentence in this bottom line and press the ENTER key to send it to the chatbox !