If you want to do real editing of the pdf data, you probably want their Editor software. What you can do is white out a section ( remove what is there) and then type over it. You can paste information from another source to add pages or information. If I want a real editor, I use a website to do that or generate raw from a Word type document. 99% of the time on a PDF all I want to do is type something in to add information / delete information or just highlight words for clients attention - signature lines. I can do that with their Reader version.