You might start here.
http://www.phpbb.com/support/documen...ed0c6d1f79a1b0
Theres alot more involved than simply uploading all the files.. and yes you UPLOAD THEM all.. and they must be in their directories and folders just as they are on your hard drive. You must also configure it and make a database.
It might be much easier to INSTALL one from your cpanel, fantastico.
Karen