Account Notes lets you add notes to any account, view all notes associated with a particular account, and see the user who added each note along with its timestamp.
Adding and viewing account notes
To add a new note or view existing notes for an account:
Go to Manage (globe icon) in the left menu.
Select Accounts.
Click on an account from the list.
Go to Settings & Tools under Account Actions near the top.
In the toolbar under the metrics row, click the pencil icon.
Enter a new note and click Save.
(Optional) For existing notes, edit or delete them by hovering over a note and selecting the pencil icon.
Click the X to return to account settings.