Use the tools in the toolbar to mark up the PDF (or use the
Select a rectangular area in an image to copy or delete.
Redaction Selection
Click a shape, then drag it where you want. To resize the shape, use the blue handles. If it has green handles, use them to alter the shape.
You can zoom and highlight shapes using these tools:
Zoom
Type your text, then drag the text box where you want.
Sign Add effects to a PDF in Preview on Mac