I've never used shutterfly before, so I'm looking at it trying to understand exactly how it works. The one I use is photobucket (it's free). On that site, you have to upload and then resize the photo, I use 640x480, and then you can copy the image code and paste it here and it should show up in the post. Shutterfly is probably similar, but if you can't get it to work, i do recommend photobucket. If you use the bulk uploader, it's easy to use.
Oh good! Glad you got it! Now, of your collection!