Robinhood will not send a 1099div and I had to sum up the dividends using the amounts in the app. How do I report this amount on 1040 without the 1099div?
Yes, you'll still need to report this dividend income on your return, even if you don't receive a Form 1099-DIV. You can still enter this income in the 1099-DIV interview, just as if you'd received a 1099-DIV.
Please see TurboTaxKatrinaB's entry guidance below.