The stages are pretty clearly described. Focus on acing the coding challenge. Practice with Leetcode and if you can get a Codesignal sub, use that also. After scaling the badge for coding challenge, for the interview proper, express enthusiasm in getting the job and be positive.

It's an online process no need to go anywhere. You can track the progress on the portal itself. For feedback, you have a different portal you can use and also the hiring team will follow up with you if you get stuck at any stage.