All you need to do to start using CLEO as your prop firm trading platform, is purchase a challenge with the prop firm. No need to set up anything on the CLEO platform itself. No need to open an account on the cleo.finance website.
You’ll get all the credentials via email. This email will be sent via the prop firm after you purchase the account.
If you’d like you can try the platform first with a trial challenge through HyroTrader.