Step 1: In your Zotero library, click on an item with an attached PDF.
Step 2: Zotero's PDF Reader window will open. Use the annotation toolbar in the top menu to annotate the PDF.
Highlight:
The first icon in the annotation toolbar is for highlighting. Click the pen, then highlight the text you would like to annotate. (Pro Tip: Click the last icon (color) before clicking the highlight pen to select your desired highlight color.)
Stickynote:
Clicking the second icon will add a stickynote at the location that you select in the PDF.
Select a section or image:
The third icon in the toolbar can be used to select a section or image to annotate. The text and/or image(s) selected will appear in the annotation panel on the left.
Color Coding:
The last option in the toolbar is for color coding. Click this icon first to select the color for your annotations. Then click the icon for your chosen annotation type (highlight, sticky note, or select).