How can I change the register page?

in the user register page, it still shows the demo page text:

Try passbolt demo today!

Enter your details in the form. We will send you an email to get you started.

Disclaimer: Please use a disposable email address. Do not use your real email address if you are not confortable with other testers being able to see it.

Warning: Demo data will be deleted periodically. This is a demo instance of passbolt for trial purposes only. Do not use it to store sensitive information.

By signing up, you agree to the Terms of Service and Privacy Policy, including our use of Cookies.

Open user registration was always meant to be for a “demo mode”. In production we recommend that your administrator controls the user signup.

You can of course edit the registration template to suits your needs.
See: src/Template/Users/register.ctp and src/Template/Users/register_thank_you.ctp