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 Account Notes icon (pencil inside a square).
Type a new note.
Click Save.
When you've finished inputting your note(s) and viewing existing ones, click the X to return to account settings.
Notes are automatically saved with timestamps and the author's name. You can edit or delete notes you created by clicking the pencil icon next to them.