1.Go to Insights-> Email->Email Stats->Click on download option which is present in the top right(down arrow button)->Click on Report scheduler.

PFB screenshot for your reference.

2.Add the Name of the report(Depends upon you what name you want to keep)

3.Add the Start and end date/time

4.Select the frequency(daily/weekly/monthly), its up to your requirement.

5.Click on Summary or detailed, its up to your requirement.

6.Select the necessary columns you need and click on Save.

PFB screenshot for your reference.

7. You can check the status of the scheduled reports and also you can edit the report if you need to add a new column or add/remove a email in the below section.

Go to Insights->Scheduled reports