Footnotes and Endnotes are used to provide additional information about a word or phrase within a document. The text is marked with a small, superscripted number. If you insert a footnote, the associated text can be placed either at the bottom of the page. An endnote can be displayed either at the end of the section or at the end of the whole document. Both footnotes and endnotes are separated from the remainder of the text by a small horizontal line.
Choose Show Notes from the Footnotes group, scroll to the footnote and make the required changes.
The only way to delete a footnote/endnote is to select the footnote/endnote reference mark in the text of the document and then press Delete.