In order to convert a file you drag the file into the main iVI window (where it says Drag Video Here). To start converting the file select it in the window and then press the Convert button on the windows Toolbar. The file will now vanish from this view. Next will see your file now listed on the Conversion Queue. When the conversion is finished you can see the converted file in Finder by pressing the magnifying glass icon next to it on the Conversion Queue.