How do I set up a master slide in Keynote that provides placeholders for multiple images?

Question

I came across an article in Mac|Life (Oct 2012 p90) titled "Create a Stylish Slideshow".  The steps include creating a master slide that allows for you to add multiple photos.  My master slide list for all themes allows for only one photo per slide.  What am I missing and how can I set up a slide to which I can add multiple photos as they do in this article?  Yes, I am using Keynote '09 v5.3.

Answer 1

Thanks for the info.  Following the instructions which are covered in chap 12 of the User Manual, I found that I cannot use shapes as placeholders.  The only success I experienced was if I used an actual photo image.  With photos I could select  Define as Media Placeholder, with Shapes, the only option was to Define as Text Placeholder.  I will address this with a thorough review of chapter 12.  
My initial problem was that I assumed that all themes in Keynote possessed the same set of Master slides.  When I found this not to be the case I looked at each theme and identified 12 of the 44 provided different master slide options which provided placeholders for more than 1 photo (a few provided up to 6).  For helpful information for others, here is a listing of those themes that provide master slides for more than 1 photo:  Editorial, Kyoto, Brushed Canvas, Typeset, Craft, Stock Book, Blue Print, Vellum, Modern Portfolio, White Corners, Storyboard, Formal. 
Thanks again.  Your feedback got me on the right track to resolving my problem.