To use EndNote Web off campus you will need to sign up to Web of Knowledge for a personal account (also known as web of science) you can then use the same username and password for EndNote Web because it recognises Web of Knowledge personal accounts.
EndNote is a database for storing and retrieving references. You can use EndNote to save references, insert citations into word processed documents and automatically compile reference lists in any chosen format.
You can purchase the Endnote client if you wish- currently on version X6, for a reduced rate from AdeptScientific. Login to se the discount price.
For more information See EndNote Web Guide
For an Endnote Tutorial go to: http://www.cardiff.ac.uk/insrv/educationandtraining/guides/endnote/index.html