To learn how to install WEKA a text mining tool then download the below document file.
https://docs.google.com/file/d/0BxNl7GbwZiZhVTJEbUswZTlUVnM/edit?usp=sharing
This
is the GUI you get when started. You have 4 options Explorer, Experimenter,
KnowledgeFlow and Simple CLI. Detail on each module is in my next post. Comment if you have any doubts.