How can I view and block sources in Statistics?

To view and block sources in Statistics:

1. Click the Statistics tab in the menu, and then click Screening.
2. Set a suitable period in the time period drop list on the top of the page.
3. Click on Details at the top right corner of an inbox chart to view the inbox sources.
4. In the top chart, switch the Active toggle from active (blue) to inactive (grey) to block sources.

The Statistics function is only available for superusers and Admin.