Note: this functionality is specific to EndNote X9 Desktop, and has been removed as a component of EndNote X9 Online.
The file in which you store your bibliographic references is called a library. You may place all of your references in one library, or you may create multiple libraries. The first time you open EndNote, a dialog box will appear that allows you to Create a new EndNote library or to Open an existing EndNote library. On subsequent occasions, if this dialog box doesn’t appear, click on File/New to create a new library, or File/Open to open an existing library.
At the prompt, give your library a name, choose where you want to save the file, and then your new, blank, library will appear. Now you are ready to add references to your library.