- Create note: Right click somewhere on a page and select "Create Note..."
- Edit note: Double click somewhere on or near the text in the note
- Save note: Just click outside of the note
- Delete note: Hover over the note and click on the `X` on the left side of the note
- Move and resize note: Hover over the note and click and drag on the grey bar on top resp. the handler in the lower right corner of the note
For more and detailed information, please have a look at the user guide
Or for a quick overview, have a look at the FloatNotes cheat sheet
(no worries, it looks more complicated then it is):