Start MaxProfit and open Journal of documents (Menu-->Documents-->Journal of documents)
In the "Journal of documents" open the "Data import" panel with the button
In the "Data import" panel in the "Data format" field select the value "NinjaTrader 8 online". Click the "Start import" button
A few seconds after you perform another transaction (purchase or sale) in the NinjaTrader terminal, a new "Transaction" document will appear in your journal. You can open it with a double click and add additional information, such as: screenshots, video, audio, comment, orders and additional properties.