Where's the "play" button?. I need to shuffle my slideshow!!

The Play button is now part of the tool bar. You might need to increase the size of the app window to see it. When you click it you will see the Settings window, click on the Shuffle Slide order box to select it.

Okay, now I am feeling really dumb here--I cannot find the Shuffle button. I have my iPhoto window maximized, I am looking at the slideshow toolbar at the bottom of the screen and see the Play button to the left side and the Music button at the right. I clicked Settings (below the icon that looks like a gear), and I do not see anything about Shuffle or playing the pictures in random order. What am I missing??

Okay, I finally figured out where you were talking about. When you are in the Library or Album window and click the Play button at the right of the toolbar, you get slideshow settings that include an option to shuffle the pictures. However, if you click the Slideshow button to create a slideshow from a group of pictures, Album, etc., the Settings button in the Slideshow toolbar does not have an option for shuffling the pictures. The pictures play in the order they are shown in the top row where it shows the thumbnails. If you want to change the order, you have to reorder the thumbnails.