2. Find the Insert tab in the menu bar, select the Header and Footer icon under the tab, and then click it with the left mouse button.

3. At this time, the text on the page turns gray and cannot be edited, but the watermark on the back of the text can be edited.

4. Click on the watermark, you can see that this is a picture watermark, because there are several small squares around this picture, and the picture can be edited at this time.

5. delete the picture with the keyboard delete key, and you can see that the watermark is gone.

6. Double-click the mouse on the page to exit the header and footer editing mode, and the page text will become normal color for editing again, but the watermark on the page has disappeared.