Using the plug-in is very straightforward:

1. Select all photos for which you would like to convert the background to transparency
2. Start the export:
   Menu -> File -> Export
   or mouse <right-click>
3. Select the "Transparency Exporter" task at "Export to", see (1)
4. Specify the general Lightroom export settings like location (2)
   These settings determine the size and quality of the export file and also for the converted PNG file
5. Specify the specific settings for the conversion of the background color to tranpsarency at (3)
6. Click "Export"