Go to https://sellercentral.amazon.com and log in to your account:
Click on the Reports tab and then on Payments:
Under Payments, click on Date Range Reports and then on Generate Reports
IMPORTANT: Click on Summary, Custom and select yesterday's date on From and To.
A report will be generated. Click on the download button and download the report:
This should generate a PDF file (like the one below):
If you got a CSV file (or excel file), you have generated and downloaded a Transaction report, not a summary. You'll have to go back and repeat the steps on this thread.