There's not much to it, really...
- Create a User Account.
- Add photos if you want others to see them.
- Edit your fridge to show your photos or other peoples'.
- Send notifications to others that you exist, in case they want a piece of your fridge on theirs.
For example: A typical set of users is an extended family. Let's say you've got Granny Smith, her two sons Hiram and Murdock, and their children.
- Each of Hiram and Murdock's children can create an account for them/their families and upload their own pictures to it.
- Hiram and Murdock each create an account that shows pictures from their children on it.
- Granny Smith's fridge then has Hiram and Murdock added to it, so that pictures from all three generations can show up on it.
- The parents of Hiram and Murdock's wives can also have fridges that include Hiram and Murdock's families.