This is found on what is called the Top menu bar, and it is hidden unless you go into the Advanced mode.

MENU CONTENTS

Your Identity

You can link your TiddlySpace username and password to other verified web identities such as Open ID

Your Spaces

This is where you can Make a new space or select and open other spaces (wikis) that you already curate - if you have other spaces they will be listed out here. For instance, some people use TiddlyWiki's in TiddlySpace to organise notes, project-manage, etc...

Your password

This is where you can opt to change your password to a new one.

To GET OUT of the menu

Click anywhere OFF the drop-down box, on the dark background.