To configure your local EndNote 20 library to connect with EndNote Online:
On the EndNote library window toolbar, select Sync Configuration in the top left-hand corner.
Enter your EndNote Online account credentials.
Note: If you don’t have an EndNote Online account, you can register by selecting Sign Up. Once you've created your account, it is vital to create a back-up of your desktop EndNote library before syncing it with EndNote Online.
View your EndNote Online library from the Help menu in EndNote 20 desktop, and select EndNote Online.
Sync your library
Once you've configured your EndNote 20 desktop library to sync with your online library, you can activate the sync process and check on its status:
Click on Sync Status on the top left-hand side of the screen. The sync stats of your library will be displayed.
Click on Sync Now in the top right-hand side of the screen, to initiate a refreshed sync status.