Chat is located in the bottom menu bar. All you need to do is to click on the words "Fair Tax Nation" and the chat box will open. Then start typing in the lower box of the window. To close the window just click on the words again. The box will go away.
Go to the bottom of the screen where it shows "Fair Tax Nation (XX members online)" Click on the bar and the chat window should open. To close the window, click on the same bar (now at the top of the chat box) Then all you need to do is to type in the small box at the bottom of the chat window.