The Thesaurus Navigator is located on the left of your work space in Thesaurus view. It unfolds a hierarchic structure of descriptive key words that you can apply to your texts and objects in their "passport".
You can add entries to the Thesaurus, if you have editor rights. There are following buttons above the Navigator:
"Add Thesaurus Root
Entry": Add a new Root Entry. Root Entries are umbrella key words that bear child entries both of
which are applicable in the passport to make use of a consistent language.
"AddThsChildEntry":
Add a new child to the selected root entry. Children can also bear other children.
Example?
"Delete": Delete
selected entry. You can find it in the register card 
"Bin".
"Search": Search the
Thesaurus for entries. BUG:
only the last word will be recognized.
"View
Menu": Views additional functions in a dropdown menu:
"Delete Permanenty": Delete selected entry completely.
"Edit
Updaters/Readers": Assign user roles for
Thesaurus entries.
Open conflict Dialog: not working
"Open Revision
History": BUG: currently
producing an error message
"Filter": Apply different filters on the available texts.
...by Project
...by Creator
...by Updaters
...by Review Status
...by Visibility
Select the right option in the opening windows (e.g. tick the box next to the updaters whose texts you like to see)
Maximize and minimize the window with 
and 
.
