If you're not able to download Zotero to the computer you're using, you can still add to your online library using the Connector:
- Click on the Zotero Connector in your browser to add an item to your library.
- When the pop-up window asks Is Zotero Running? choose Enable Saving to Online Library.

- The Connector will now add the citation and pdf (when available) to your online Zotero library.

- To see the citation information and pdf, and to make changes, log into your account at zotero.org.