Do I have to be registered to use jjiffy?

Not necessarily.

If one of your friends is a registered user of jjiffy and invites you to one of their rolls to share your photos, you can access it by simply accepting the invitation. From that moment on, when you access the jjiffy.com home page you will have all the rolls you have been invited to available in the ACCESS button that will be floating at the bottom of the home page.

In some cases the owner of the roll may have the invitation set up so that only registered users can access it. In that case you must first log in to your user account to have access to that roll, but it would not be necessary for you to have any contracted plans.