Click [Delete Last Point] to remove the last point clicked
Click [Clear All Points] to remove all areas drawn
Click [Generate KML] to generate a KML file representing the last area drawn. Once you click this option, after a short delay, a hyperlink "Download KML File Here" will appear. From this link, you can download your KML file
Click [Create New Area] to start drawing anew area whilst keeping any existing areas on-screen
You can adjust the map size by clicking Small, Medium, Large or Full Screen