How do I make a note?

I recall clicking on an icon somewhere to make a note. Now I can’t find the icon and there’s no mention of notes in the Help. Also, once notes are created, how do I view them?

Notes are added to words by clicking on the link on the right hand side of the blue bar above the dictionary view. You view them at the same place.
I use the hints field for most notes and also tags to mark words.