To manually add an item to your Zotero library, click the green “New Item” () button at the top of the center column, and select the desired item type from the drop-down menu (the top level of the menu shows recently created item types; the complete list of item types, minus Web Page, can be found under “More”). An empty item of the selected item type will now appear in the center column. You can then manually enter the item's bibliographic information via the right column.
When you have selected an item in the center column, you can view and edit its bibliographic information via the Info tab of the right column. Most fields can be clicked and edited. Changes are saved automatically as they are made. Some fields have special features, which are discussed below.