Welcome to Caedes. You asked me how you download a picture to your desktop. When you click on the size you want (just under the thumbnail of the picture) - it opens that size in a new window. Once it is showing, you right mouse button click on the picture, and select "Save target as", or "Save link as...", or whatever similar language your browser may use. Then you just choose where you want to save it, and click the save button. Hope this helps.

Nathan