How to set up Power PDF 2.0 for Stylus use on Surface Tablet
Please see the attached document for the steps with screen captures.
Go to Customize Quick Access Tool Bar / More Commands
Add Active Markup and Draw Tools and Touch/Mouse Mode if they are not there.
Open up a PDF document to be marked up.
Change the Touch/Mouse mode to Touch.
Go to the Text Markup Tool and select Text Markup Tool. (Also selectable under Comments tab)
Go to the Draw Tools and Select Pencil. (Also selectable under Comments tab)
Select the color and size of the line from the box on the document.
Draw with the Stylus. Close the dialog box and save the new document.