From within any report:
1. Click 'Print' from within the report header.
2. Select which reports you would like to print to PDF from within the report selector.
4. Click the blue 'Print' button.
Here are the various screens for different browsers:
Chrome - Click "Open in Preview" and then click save from the "File" menu.
Firefox - Click "PDF" and then "Save as PDF"
Safari - Click "PDF" and then "Save as PDF