Which output style file are you using? You will need to edit* the Author Lists setting in your output style file to identify the number of authors to list followed by “et al”. (Refer to attached image which shows listing the first six authors followed by et al, for the first appearance; and subsequent citations will list just the first three authors followed by et al.
*Go to the Endnote toolbar and select Edit > Output Styles > Edit [name of your output style file]. In the pop-up dialog box click “Author Lists” in this Citation section. Modify the settings as needed. When you exit the dialog box the changes will be saved to a new output style file with the word “Copy” added to the file name. Change the Endnote tab setting in the MS Word ribbon to use the new output style file.
