To preview what you want to scan press the preview button and you can make sure the scan is in a good position. With this done you can press the scan button to scan the document after this a dialog will show up asking you were to save what you are scanning.
To zoom in press the magnifying glass button with a plus sign conversely to move out press the magnifying glass button with a minus sign.
To launch skanlite turn on your scanner and that it is connected to your computer. To launch the application go to the menu -> graphics -> skanlite or run skanlite from the command line.
