To add a note to a suggestion, click on the "note" icon at the bottom of the content card.
This will open the full-text view and automatically scroll to the note field.
After you've typed your note, you can click "Post Note" or "Shift+Enter" or "Command/Ctrl+enter" to add it to the suggestion.
To view all of the notes left on any article, or by any team member, click on the "Notes" icon at the top of your UpContent dashboard.
From here, you can:
Sort through your topics from the drop-down menu on the left.
Add new notes to existing noted-suggestions.
Sort notes by the team-member that left them.
Delete any notes (provided you have the adequate permission level).