After purchase the software or in trial software, you are in main window of the software "Hindi Unicode to ANSI Converter
Here you can add content of Mangal Font that you want to convert in Devlys, Kruti, Narad etc Font. You can import file or open File of Mangal Font content in left panel text area by just click on "File " Menu OR by click on "Open RTF/Txt File" Button in your running software.
After completion of add text to left panel textbox, click "Start Conversion" Button in right pane. it is just single click and conversion of text into Devlys font would be started.