You can create a user in a Demo project below. (There is a limited number of demo users available).
You can then go to the Login Page and log in, leaving the password field empty.
You might want to study the Help document (it opens with the button with the question mark). In the section Operations, the basics are explained about the CadH5 view. Most important is to remember the ESC key on your keyboard.
Captcha by https://www.phpcaptcha.org/