The standard reports can be accessed from within the Insights tab that is located on the Dashboard page of each challenge or community. Access to this page can be controlled and you can read more about that in this article: Reporting: New Analytics Integrations. The Insights page itself is embedded within a Spigit page and has four distinct sections.
The red box on left side of figure 1 shows the access point for folders and reports that are saved within the workspace. To read more about managing folders and reports, please visit this article: Reporting: New Analytics Integrations.
The central section marked in yellow is the report and visualization viewing area of Insights. This section is where users add visualizations and tabs for additional visualizations within the report.
Highlighted in blue, this section is a drop down which shows options relating to Insights and Power BI Embedded. Users holding the Report Builder role will see four options in the dropdown: View, Edit, Create, and Manage.
The filter section which is highlighted in green in figure 1 is expandable and displays the filters that are available within the report tab that is being viewed currently. These filters match the filters that have been placed onto the report page and are split between visualization, page, and all page-specific filters.