1. First, open a document and select the content of the document to insert a footnote.

2. Then select Reference-Insert Footnote in the menu bar.

3. It should be noted that if the paper needs to be renumbered per page, we need to click on the small corner of the footnote (as shown in the figure), and then set the "numbering per page separately" and apply it to the whole document.

4. Click "Insert Footnote" after setting, and you can enter the content you want to mark at the bottom of the document.

5. There is no uniform regulation on the format of footnotes, and the format of references shall prevail.

6. After marking, as shown in the figure below.