The "Login" and "Password" provided in your Phase 1 email/dashboard are going to be your challenge credentials. They will be used for all your accounts and phases, including the Funded Star Account in your cTrader platform.
This is an example of how your credentials will be displayed.
You only need to switch between the accounts available on your Mobile App or Web Platform.
📱 Mobile ➝ Menu ➝ Click on the rectangle with the account number of your challenge ➝ All your available accounts will be displayed.
🖥️ Desktop ➝ Click on the top right corner.
Note: The following article may be useful for you.