To add page numbers to a Microsoft Word file, follow these steps:

1. Open the Word file that you want to add page numbers to.
2. Click the Insert tab.
3. In the Header & Footer group, click Page Number.
4. Select the location and alignment of the page numbers.
5. If you don’t want a page number to appear on the first page, select Different First Page.
6. To change the numbering style, click Format Page Numbers.
7. Select the formatting you want to use, and then click OK.
8. Click Close Header and Footer, or double-click outside of the header or footer to exit.