Once you have inserted and formatted a citation, you should not edit it directly (even though you are able to do so). Direct edits are lost the next time EndNote formats the bibliography.
You can almost always get EndNote to format your citations exactly to your specifications by editing the style, the EndNote reference, or the citation (as described here).
Note: An easy way to omit the Author or Date from an individual citation is to select the citation, right-click Control+click, select Edit Citation(s) and then Exclude Author or Exclude Year.
To edit a formatted citation:
Click on the citation you wish to change.
From Word’s Tools menu, go to the EndNote submenu, and select Edit Citation(s) to display the EndNote Edit Citation dialog. From the EndNote tab, select Edit & Manage Citations.
All of the cited references in the document are listed in the left column of the dialog. An ellipses shows where a citation appears within text. The line below shows the cited references.
Select the appropriate citation from the list at the left of the dialog (you can scroll through all citations in the document) and make any of the following changes to the highlighted citation:
Default Format: Select this menu option to display the citation and format it as defined by the currently selected output style.
Display as: Author (Year): Select this menu option to display both the author name and the year in the highlighted citation.
This feature does not apply when editing a citation in a footnote.
Exclude Author: Select this to omit the author name from the formatted citation.
Exclude Year: Select this to omit the date from the formatted citation.
Show Only in Bibliography: Select this option to display the selected citation only in the bibliography, not in the body of the paper.
Prefix: Enter text here to print immediately before the citation text (spaces are significant).
Suffix: Enter text here to print after the citation text (spaces are significant).
Pages: Enter page numbers here to print as Cited Pages. To print, the Cited Pages field must be listed in the citation template or footnote template of the output style.
You can add or remove citations from a multiple citation or change the order of citations.
Insert: Use this to add another citation within the same set of delimiters.
Remove: Highlight a citation and click Remove to delete it from the in-text citation.
Up and Down Arrows: Highlight a reference and use the arrows to change the order of display. (If a Citation Sort Order is applied by the current output style, using this dialog to change the order of citations in a multiple citation has no effect.)
Click OK to implement your change(s).
After making changes, select Configure Bibliography to (re)format the new or modified citations and regenerate the bibliography.
From the EndNote tab, select Update Citations and Bibliography or click the corner arrow to change bibliography preferences and Format Bibliography.