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how to schedule the existing reports

how to schedule the existing reports in lighning.
ShirishaShirisha (Salesforce Developers) 
Hi Sukumar,

Greetings!

To schedule a report:
On the Reports tab, click an existing report name or click New Report. If you're not seeing the enhanced Reports tab, check if you're using a supported browser and ask your administrator to enable the new user interface theme.
Click Run Report and choose Schedule Future Runs... 

Please check the below documentation for more details:

https://help.salesforce.com/articleView?id=reports_schedule.htm&type=5

Kindly let me know if it helps you and close your query by marking it as best answer so that it can help others in the future.

Warm Regards,
Shirisha Pathuri