First of all you will need to separate that image file, into 2 separate panos, left and right, then you can process the images with the droplet...
you will then get a tour.xml where you will have 2 scenes, you need to remove one of them, and the one that you keep, you need to add the stereo attribute :
<scene name="yourpano">
<preview url="yourpano-L.tiles/preview.jpg" />
<image stereo="true" stereolabels="L|R">
<cube url="yourpano-%t.tiles/pano_%s.jpg" />
<cube url="yourpano-%t.tiles/mobile_%s.jpg" devices="iOS" />
</image>
</scene>
if you need further help just ask again