EndNote comes with 100 styles - often not the one you want. Follow these steps to find other styles from EndNote.com
In EndNote, go to the Tools menu, mouse over Output Styles, and click on Open Style Manager.
Click on the Get More on the Web button.
Search for your style. The easiest way is often to search for the name of the journal or style.
Click on Download to the right of the style name.
When it has downloaded, move it to the file EndNote expects it to be in (see below to find out where this is).
In EndNote, go to the Edit menu (for Windows) or EndNote menu (for Macs).
Click on Preferences.
Click on Folder Locations.
Note the location of the Styles Folder.
EndNote may have created the appropriate folders, if not you can create a styles folder wherever you want.
If you create a styles folder, copy the path to that folder into the Styles Folder line in the Folder Locations-Preferences window.