There isn't a tracking password.
In External account for midsource, click 'Use this platform as a proxy to access the tracking servers...' then enter midsource instance name and press button.
Pressing the button permanently locks the midsource to the XtkDatabaseId of your instance, so make sure the right instance is pointing to the right midsource.
Once configured, the ootb midsource (tracking?) sync workflows will poll for logs every hour.