Please complete connection steps described in this article before connecting to Sierra Chart for the first time.
We provide Rithmic data feed and Sierra Chart has made it public that it does not longer wish to support Rithmic data feed officially. Our traders are successfully using this up to this day, however, this is at your own risk and you can read more about this over here.
Here you will find connection instructions for Sierra Chart.
The credentials you have to use are the ones you see inside your dashboard: