Reporting uses the same standard set of filters used elsewhere on the site. You can choose specific events you want to see by selecting them from a pop-up, or you can filter all events over a specific date range. Picking start date only filters to show data after that point in time. Alternatively, end date only filters data up until that point.
Optionally, you can also choose to combine both start and end dates for a specific date range. Date time filters combine with results of specific event filters if used together, and will filter to show only data for the selected event(s) within the specified time range.
After your filters have been chosen, click 'Run' to create the report data. To clear all filters, click 'Reset'.