Permission required: Reports
Most Marketplace reports run automatically when you select them from the Insights tab. For reports that you haven't run in the past, the default parameters for the report will be used. For reports you've run before, the most recently used parameters will continue to be used until you enter new parameters.
You can change the parameters for a report by clicking Run new report from the report results page and entering your desired criteria.
Depending on the report you'd like to run, some criteria (like language, audience, and subject from the Checkouts report) can be removed by clicking the red X that appears on the field when you mouse over it.