You can add items to Zotero library in several ways:
1.Using web browser info, by clicking on Zotero Connector's save button
2. By entering document identifier - ISBN, DOI, PMID
3. You can add files from your computer
4. You can add items manually
To manually add items to your Zotero library click on the New Item button (green) at the top of the center pane and select the desired item type from the drop-down menu.
The easiest way to add items to your Zotero library is by clicking on Zotero Connector save button. As you browse the web, Zotero will automatically find bibliographic information on web pages. The appearance of the save button will change, depending on the content of the web page you are viewing.
Generic webpage (there is no information that Zotero can recognize)
PDF - if you are viewing a PDF
List of search results on the webpage
Click the “Add Item by Identifier” button () at the top of the center column of the Zotero pane, type or paste in the identifier, and press Enter/Return.
To add a file from the computer drag it to Zotero library - as an independent item or as an attachment. Zotero will automatically retrieve bibliographic data for pdf files. Another way to save the files from the computer is to use Save to Zotero button.