The procedure shown here uses a PDF file sticky note as an example. The procedure is the same for Office file sticky notes.
Select [Edit] from the sticky note selection menu of the PDF file.

Switch [Viewer] on and you can view the PDF file.

MEMO
Using [
] allows you to specify and indicate content located in a sticky note.
Select
to create a sticky note of the currently displayed page.
While [Viewer] is active, you cannot create sticky notes.