You can't. However, you can create a template with this in the footer and
base your new documents on that template. That will put it in the footer of
your new documents. Note that it will not show the correct name and path,
though, until you have (1) saved the document and (2) updated the field by
printing or using Print Preview.
Resist the temptation to put this in your normal.dot template. It will cause
you problems when you least can afford them.
Charles Kenyon