For information on the market data used by PropReports please see How PropReports Prices Securities.
To change a closing price:
1. Click on the 'Audit' tab
2. Click on the 'Close Prices' tab.
3. Click 'Show All'
4. Enter the symbol and click 'Find'
5. Click edit next to the quote for the appropriate date, enter a new price and click 'Update'. Alternately, you can click on 'Use This Price' to use the price from an alternative data source for that day.