I worked it out You have to re-open the document using the "Edit PDF" menu & its good because you don't lose your interactive form fields while editing the background text. This may have sold me now!
Just trialing the product before purchasing. When Converting a PDF to a Word doc (which was originally a word doc), it seems to just make the PDF a "Picture" in a word doc. You can't edit any of the text?? Seems very limited... I do like the form function of turning a PDF into an interactive form - but if I want to edit the original content, I can't once I've converted the Word Doc to PDF - if there is a way, please shed some light. Thanks