Here is how to proceed:
1. a) Click on the slideshow. This will bring you directly to the corresponding picture in Picasa web.
1. b) Stop the slideshow and cycle through the pictures in order to select one that you want, then click on it. This will bring you directly to the corresponding picture in Picasa web.
2. Click on the "Download" menu, then choose "Download Picture" (exact wording may vary).
3. Please leave a short comment on Picasa web...
That's it, you're done. You may repeat for other pictures if you wish.
You can use these pictures on your own computer(s) for your private use only. Distribution is not permitted. You may instead distribute the link(s) to the images on Picasa. This would fit the bill nicely.
Come back regularly and see which pictures could be of interest to you!