To create a Demo account for demo simulated trading, open the iBroker App in your device and go to the Demo Login screen or to the Help section in Settings. Look for the "Create Demo Account" option. Fill out the form and you will get your credentials for immediate login. Once you create the Demo account, log in and you will be able to simulate trading with full iBroker functionality.
You will also get your credentials in your email account, and you will need to validate your email using the link provided. If you don't validate it, you will be prompted to validate when logging into the app after 24 hours.