Due to the fact that the broker does not support downloading reports "out of the box", use the extension for the Google Chrome browser:
- Install the extension
- Log into the Robinhood broker's personal account
- Click on the extension icon in the upper left menu of the browser
- Select Export History in the extension settings
How to import new transactions
Later, when you'll start making new trades or receive dividends you can just get new statements from the date of your last import and upload them by clicking a plus sign on a top panel -> Import a spreadsheet.