Saving
To save an item to your collection, simply click the Zotero save icon. The Zotero save icon (circled in red below) appears to the right of your browser's address bar:
In order to save the full-text of an article or book chapter, look for this icon: 
The Zotero icon will change depending upon what type of resource you are viewing.
Here are several different icons.
Book: 
Magazine: 
Newspaper: 
Webpages: Some webpages don't provide any information that Zotero can recognize. On these pages, the save button will show a gray webpage icon. If you click the save button on these pages, Zotero will import the page as a “Web Page” item with a title, URL, and access dates.
Multiple Results or collections:
Some webpages that contain information about multiple items (for example, lists of OneSearch results), the save button will be appear as a folder icon: 
Clicking this folder icon will open a window where you can select the items that you want to save to Zotero.