Hi Olivia,
The beauty of smugmug is that you don't have to purchase. Under the large picture displayed on the right of the screen there is a line labeled "current". Simply choose the size of the picture you wish to download (o is the original size - I uploaded my pics at the original resolution), wait for the display to refresh with that size image and then choose save. It's yours!
You can purchase prints through them - they are more expensive than the Kodak site but the quality is very high. I've never been disappointed with the prints I've ordered.
Have fun.
Mary Ellen