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Open the browser using the link, also open the folder containing the image, click on the image and while still holding the button, drag it across to the browser window and over the area at the bottom of the tool website. The dotted line around the drop area will turn green, drop it on the panel (let go of the mouse button). Once you have set the parameters for the generated lithophane, click on the image that you dropped onto the bottom panel and it will be converted to an STL and the file will download automatically. see: http://en.wikipedia.org/wiki/Drag_and_drop for more information on 'Drag and Drop'.