To do so, go to the "Tools" menu and click "Edit PDF" if editing is not enabled. Then, in the toolbar, click "Header & Footer" then "Add" to add a header or footer to the document to display the page numbers.
To do so, go to the "Tools" menu and click "Edit PDF" if editing is not enabled. Then, in the toolbar, click "Header & Footer" then "Add" to add a header or footer to the document to display the page numbers.