Look at the right edge. That tab is the whole product: click it and the desk slides out over the site you are already reading.

You are signed in already, because this is the demo — on a real Tulsa site a signed-out visitor's page contains no tab at all, which is the point. Edit a heading, switch the theme, write something. This demo runs on an ephemeral disk, so whatever you do to it is gone the next time it wakes up.

Changing the password and uploading pictures are the two things turned off here, so the next person finds it the way you did. Both work normally on your own install.