As Mungo suggests, it shouldn't require anything more than going to View>
Header & Footer or switching to Page Layout View & double-clicking the H/F
you want to change. If something is preventing you from doing so you'll have
to take the time to accurately describe how you're attempting to go about it
as well as what it is that happens when you try.
Simple one-line statements give nobody any clue as to what the problem is,
let alone any meaningful ideas or suggestions to offer. It's also a good
idea to indicate your exact update levels of both Office as well as OS X.
Regards |:>)
Bob Jones
[MVP] Office:Mac