Cannot install the chat on my server

[nobtiba]

I follow the instruction here for installation:
http://www.phpfreechat.net/quickstart
I download, extract but no "data" folder under the main folder, so I created it and "public" and "private" then give it permission right 777.
Then I go to the link of the main folder but there's no chat or anything.
Pls tell me how to do it right ! Thank you!