Press the Day Notes button at the top of the Appointments screen. The box below will be shown. The button on the first window that comes up will give you the option to create a New note or Update an existing note, if there is one on there already.



The Day Note added then appears at the bottom of the day in a pale yellow colour (like a "Post-It" note) in the Diary and also at the top of the "Arrivals" widget on The Home Screen