[iText-questions] edit a pdf

[Rhodri Davies]

Hi guys   I'm a newbie to iText so sorry if this is too simple for some of you...:   I'm just looking at for a code snippet to edit an existing PDF doc.   I have looked at PdfStamper / PdfReader / PdfWriter, but can't quite work it out.   I would like the documents reference code to be printed in the bottom corner of each page of the existing document...   I like HeaderFooter, but I can't get it working with existing PDF's.   Thanks in advance.   Rhodri D