If you want to see all of your notes, click on Notes, under the Personal category in the upper part of your CooSpace page, and "My notes" will appear, where all your notes will be listed.  

First, you can see the scene or tool's name, where a certain note was made. You can also modify the note by clicking on the "pencil" icon next to it, or delete it by clicking on the trashbin icon. 

If the scene or tool has been deleted by the administrator, you can still find the notes from the deleted scene/tool, but these notes will be strike-through.