After download and installation click "Prevent Recovery" shortcut on your Desktop. You will see welcome window with some helpful links. Next button will be located on the right bottom part of the program screen. Click it to continue.
This step let you choose how you wish to replace deleted files and deleted fragments of data, and which security algorithm to use. One more option on this screen allows you empty Recycle Bin to prevent recovery of items located there.
Program will start working. You will see progress bar for all selected disk(s) and estimated time. You will also see one more option to turn off computer when all operations will be complete.
