If you log out, that's the password you'll use to log in again. The login session is good for a while so you can continue to login with already-authenticated identities (and you can have as many as you want) on persona-enabled sites.

Thanks for clarifying. I was assuming that was the case but the login/creation page needs to have a graphic or a narrative talking about what it does and how the process works a bit more before it reaches a more public audience. As a software developer I had an idea of how the thing worked but it wasn't spelled out enough. I understand that it's beta but the whole thing is weakly documented from a user's standpoint as to why it should be trusted.