To Download a Single Image: Select a thumbnail image from the left, then click on the large image on the right for full screen view.
Then click on the Download Tool next to the Size Choice Tool to download to your Downloads Folder (the filename will not match the file name in the gallery)
To Share: Click on the Share Tool in the tool bar at the lower right corner of the image and select the appropriate tab for an individual image link, a gallery link, or a social media or email link