To load, export and download a report:
From the left menu, click Reports
Click on the report you'd like to export
Use the drop-down boxes to select the event, session etc you'd like data on
Click Generate report
Select your file type from the drop-down menu that loads with your report
Click the Export button
to download the file to your device
Most spreadsheet programs will open CSV files, but you can also export as an Excel file (XLS)
Learn more about reporting here.