Deleting an endnote library

I’ve ended up with more than one copy of a particular library and would like to delete the redundant ones. How do i do that, anyone know? 

Delete the library .enl file and the associated .DATA folder and all contents which located in the same folder and the .enl file.  Are you asking how to eliminate the library the the online version is synced to?  If so that is a whole nother question.  

Hi, How will I find where’s the data folder of a partifuclar library?

It lives in the same folder as the library pointer file.  so if you have a library.enl there will be a library.DATA folder in the same folder.