I think I understand now. You are trying to change the default folder into which these 'Acrobat documents' - i.e. PDFs - are saved?
I think you have two choices although I am not sure which one mught work for you. Under Start>Settings>Printers, highlight Distiller, and then right click and choose Properties (or go to File>Properties). Under the details tab, there is a box called 'Print to the following port' which I think is the default path for saving PDFs to - but I could be wrong here and perhaps you can't change it. But this may be where you will find the setting ('PDF output') you mentioned.
The other alternative is to explore the Settings menu in Distiller itself. You can add new folders here, but I think it is where Distiller stores postscript files not yet turned into PDFs. It's a way of batch processing lots of postscript to PDF actions.
Other than that, I'm sorry I can't be of more help.