Here is the Clarivate Analytics KB link for Endnote X7: https://support.clarivate.com/Endnote/s/article/EndNote-Windows-and-Mac-Style-Editing-Guide?language=en_US
Here are the Clarivate Analytics KB links to X8 style editing Guides.
Guides to edit styles are Here (Windows) and Here (Mac).
and because I like everything in one "go to " place. Here are the instructions to handle Journal names and Abbreviations correctly.