When you first visit the Instant Feedback page, you will see all notes written about everyone in the system which you're allowed to see (i.e. the visibility setting used for the note permitted you to see it in the first place).
To see notes about yourself, click the drop-down arrow next to "About Everyone" and select "About me"
To see notes about someone else in the system, use the "Search" option to find a colleague by name.
Again, you will not necessarily be able to see all notes about a particular person, depending on the visibility settings used for the notes. See our article on visibility settings for more information.