Open a BI report (you can access them from the BI REPORTS menu), then click the EXPORT button. Choose an export option:
For more information about the export options and other details, check out the Exporting a BI Report section on the User Guide.
Viewing a List of Exported Reports / Redownloading Exported Reports
You can see a list of already exported report and redownload them from the System > Report export screen.