Click the middle of the picture to begin.
The controls at the bottom may not work.
If you wish to have the show seen in Full screen mode,
Begin the show.
then just scroll to the bottom of the page if needed,
then use your mouse to touch the bottom of the image,
you will see a control line.
Click the item on the far right of the control line.
It will bring up a menu with an item that says, "Full screen".
Click it to get in and out of Full screen mode.