Go to http://www.myendnoteweb.com/ while on campus, and follow the instructions to create your EndNote Web/Online account.
You can also create an account via Web of Science. Choose the EndNote link at the top right of the screen.
After logging in, click “Download Installers” at the bottom of the page. Download and install the Cite While You Write installer.
There are other installers you can use with Endnote Online besides Cite While You Write.