How to see the total bills?

[Karak komar]

I don't know how I can see the total bills like example for every day he's total sale.

[Andy]

Maybe you are talking about receipts? You can see all receipts at the back office in Reports menu and Receipt section. 

You can choose the desired period for the report with the time selectors at the top of the page.

Details about Receipts report are here: Receipts Section in the Reports in the Back Office