There will be some reports that are going to show as KPI reports when you go to the reports Module.
The section can be tailored to show reports that you will use most often and will offer one click access to that report.
To add or remove a report from KPI:
Go to Modules and Configuration
Then select reports
Select the report group from the dropdown and then tick/untick the KPI box beside the report you wish to add/remove to the KPI list