If you are already using the desktop version of EndNote X6 or later, simply use the account login and password you have created for that account. Your references will sync to the web version.
If you do not have an account, click on the link below and use the 'sign up' link. Do not use the Institutional login.
The basic version of EndNote on the web is free, but you will get more storage if you log in to a desktop version of EndNote or the Web of Science database using the same account.