Open the word document, find the tool insertion column in the toolbar above, and click it.

2. After entering the interface, find the header and footer in the toolbar, or click twice on the top and bottom blank spaces of the document (click where the approximate location of the page number is displayed).

3. After clicking, a header and footer will appear on the document, with an inserted page number on them.

4. First turn the page to the third page. There is a small inverted triangle next to the inserted page number. Click it and an interface will appear. Click on the instructions in the middle, this page and beyond, and then click OK.

5. After confirmation, the page number will appear with several instructions on it, which can be modified at any time.