Headers?

In the View menu (assuming it has one) find Header and footer. Voilá.

Insert a page number field--a field is a bit of text that changes for you, like the date, page number, or even address if you are merging to with a address file.

In OpenOffice, it's Insert...Fields...Page Number. I don't know where it is much of anywhere else. Somewhere under Insert, I'd guess.

I'm not sure because I don't have Word 04 for the Macintosh, but if you don't find it under insert, try doing a search in the help for "field."

Assuming that Word 2004 for Macs has the same controls as Word 2003 for Windows (which may not be the case),

After you do View --> Header and Footer, in addition to the box where you type the header text, you should also see a floating tool bar that says Header and Footer at the top and has several icons on it. At the point in the header where you want the page number to be, click the icon that's a # on a white rectangle. (Try hovering your mouse over each of the icons. That should show what they do.)

Alternatively, at the point in the header where you want the page number to be, do Insert --> Field, and scroll down the list to Page.

My copy of Word2003 (for PC) has "Page Numbers..." as a command under the Insert Menu (Insert--> Page Numbers...). You don't have to mess around with fields-- the command is ready and waiting in the commonly used menu.

And yeah, look for the floating Header and Footer toolbar. It has all sorts of nifty tools on it. =)