You can participate by adding a journal, contributing to one, or both.
There are three types of journals:
Traveling
This is a journal that is sent by mail to a list of people who sign up. You control how many people can sign up, if it’s open to everyone, or only by invitation, and if there’s a theme.
Location
A journal that stays at one public location, such as a cafe, shop, or bookstore. It should be open to everyone, but they’ll have to visit the location. These should be controlled (not left somewhere), and before placing one at a place of business, make sure to have per mission from the owner.
Personal
Your own personal journal that you post to the site to share (you must scan the journal). If you just started one, or have kept them for 35 years, this is your opportunity to share them with the world.