First, insert a delimiter on page n as follows: 1. Move the cursor to the beginning of page n, and select Insert-Delimiter-Select Next-OK in the pop-up dialog box; 2. Select the view in the menu bar-Header and Footer, move the mouse to the footer on page n, and then uncheck the "Link to previous page" on the "Header and Footer" toolbar without closing the toolbar. 3. Next, insert-page number and select the format in the pop-up dialog box. In the newly pop-up dialog box, select the start page number, which defaults to 1. 4. Problem solved, OK! 2. After the operation, the page number is not displayed on the back cover. Please follow the following steps to solve the problem: 1. Insert a separator at the bottom of the previous page on the back cover, and select "Next Page"-OK in the dialog box that appears later; 2. Click on the last page where you don't want to display the page number, and the page number and footer editor will open accordingly. Select this damn page number and uncheck "Link to previous page". 3. Turn off the editing status of headers and footers.