After you have saved the *.txt or *.inp file, press the "RUN" button.
There are two steps in running the input card data. In the first step you must choose the FLUKA home directory - the directory where the FLUKA Code was installed.
After that you must choose where to save the input file -
To create the run file, you must link FLUKA by entering the appropriate command-line parameters -
Now you can run the FLUKA command.