Leatherneck:
1. at the main page, click on the orange sign up button (free 25 prints)
2. fill out the personal info., then clik on sign up.
3. then this should take you to the welcome page
4. on the welcome page (My shutterfly), on the right hand column there is a link to special offers...clik on that and it'll let you enter the code ...
hope that helps.
LS