It really is very simple. There are many Photopass photographers located throughout all the parks. They usually wear these tan vests, you will recognize them, they have big cameras.
You have them take pictures of your party. As many as you wish. Then, you can do several things. First, you can go to any photo location in any of the parks and view your pics. When you see one that you love, you redeem said cupon for a free 5x7. I have done this twice already. I have used them for the pics I can not take myself. Like the one’s with special effects. I have one of DD holding baby Simba.
Next, if you wish, you can view any and all pics at home on index for up to 30 days following your vacation. You can add borders, special signatures and such. Then you purchase as many as you wish, you can even purchase a CD with all of your pics on it.
Finally, you wait for your pics to arrive and enjoy them.
I hope this helped.