At first, run the application and then choose among the options according to which the mouse wheel will control the brightness.
Then it is necessary to press on the "OK" button in order the options to take effect.
Next times, the application will run minimize to the Window System tray and you can open the options window with a right click on the Brightness Wheel icon and selecting open the menu or with a double click on the Brightness Wheel icon in the system tray.
You can also show a brightness bar when you control the brightness
To specify its options and colors select "Options" from the "Options" menu.
Uncheck "Show Brightness Bar" if you do not want to show it and press the "OK" button.