To import or update historic price data, just press the house button. There you will se a tab where you can import/export data.
On this page you can import price data of instruments to Bricknode Broker.
The file that you import should be in CSV-format.
Select the action/actions you wish to perform, and upload the file.
You can also press the question mark in the top right corner to get more information and to download an example file.