How to Add Notes to a PDF on Mac
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1. Open the PDF document in Highlights
From the menu bar choose File > Open. Locate and select the file you want to open, then click Open:
The PDF opens in a document window:
2. Select the note tool in the toolbar
3. Click where you want the note in the PDF
The note appears at the selected location and an annotation popover window appears:
4. Type your comment in the popover
Click outside the popover to close it. Your note is added to the PDF and the comment shows up in your notes which you can easily share.
You can also add comments to other types of PDF annotations including highlighted text and image selections by clicking on them and typing in the text field of the annotation popover.