Footnotes may be created in the editor by placing the cursor where you would like the footnote link, right-clicking, and choosing Insert > Footnote. You may edit the visible text of the footnote either in the Ribbon or by editing the element directly. When you add or remove footnotes, the footnote list should be updated appropriately. If not, simply click on an existing footnote, and it will update the numbers appropriately. Footnote numbers will also be updated when the page saves.