Position the cursor at the beginning of the next page and press. As you add and delete elements, you might find manual page breaks no longer appropriate. (Page Break is on the Insert menu in Word 2003.) Unfortunately, manual page breaks (also known as hard page breaks) cause trouble because they don't flow with the document's structure. Or, click the Page Break option in the Pages group on the Insert tab. You can create a new page at any time by pressing +. Users don't always realize that they're the problem - they inserted the breaks, whether intentionally or not.
Documents end up with unwanted breaks that play havoc with page numbering, formats, and printing.
Other than styles, page and section breaks probably cause the most confusion and trouble for the untrained user.