You cannot delete the standard reports. You can only delete:
Reports that were saved using the Save As report menu option. See Save and Share Reports for more information.
Custom reports you have uploaded using the Custom Reports tab in Administration.
To delete a personal/global report that you added using the report menu Save As option:
On the Navigation menu, click Reports » <Report Category>.
Select the custom report you want to delete.
Click .
A message displays asking you to confirm your request.
Click Yes to confirm the deletion.
Click No to cancel the request and return to the Reports tab.
To delete a custom report from the Custom Reports tab:
On the Navigation menu, click Administration » Report Administration.
Click the Custom Reports tab.
Select the report you want to delete and click .
Click .
Schedule the delivery of a report