1.) In the EndNote Web tab click on Edit Citation(s)
2.) Select the citation to which you want to add page numbers
3.) In the Pages box, add the page numbers. Just type in the numbers without any abbreviations (p., pp., etc.); EndNote Web will format with the abbreviation for the citation style you have selected
4.) To remove a footnote or endnote, simple delete the footnote or endnote reference number in the document
5.) The citation will be removed but the bibliography reference will remain; to delete it, click Update Citations and Bibliography under the EndNote Web tab