If you don't see page numbers on the screen or under File > Print Preview, go to Document > Header and Footer Options. Make sure the Show Header box is checked:
If you do see page numbers on screen but not under File > Print Preview, the page number may be outside the printable area of the page.
1. Go to Document > Header and Footer;
2. If the page number field at the upper right is anchored to a tab stop in the ruler bar, drag that tab stop to the left a couple of ticks
or
3. If there is no tab stop, place your cursor to the right of the page number field and period below the ruler. Hit the space bar a couple of times to move the page number field to the left a couple of ticks.
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