When writing an essay in Word, you often have a front page and a table of contents, and page numbers should therefore not start on page 1, but perhaps first on page 3.
Click at the end of the last page, which should not have page numbers (typically the table of contents).
Select the Page Layout tab. Select Change - Next Page
Go to the first page that should have page numbers.
Double click in the footer. The "Header and Footer Tools" tab opens.
Click "Link to previous" so that the selection disappears.
Select the Insert tab.
Select Page Number - Format Page Number.
Select Start at: 1.
Select Page Number and select Page Number Location.