Support and help on using EndNote is available from your subject librarian.
Training sessions are regularly run by the library, please check the library's training calendar or Myfuture for upcoming courses.
Subject Librarians can usually advise on technical issues, but you can also go directly to EndNote support for help (just complete the online form).
Detailed support, advice articles and FAQs are available from Clarivate (EndNote's parent company):
EndNote Support pages
Clarivate EndNote Frequently Asked Questions (FAQ)
The official EndNote 21 User Help Guide (for Windows) is available here.