Open the email from the HES in your mailbox and follow the link in it.
Then click the "Use Hideez Authenticator" button. Also here you can change the display language.
Here you can download Hideez Authenticator for your OS from Google Play or App Store via corresponding links.
Open Hideez Authenticator and scan the QR code on HES.
Confirm SSO enrollment on Hideez Authenticator.
If you already registered security key for SSO, you can register mobile app following this guides - iOS, Android.
Click on the web browser the "Sign in with a Hideez Authenticator App" button.
Open Hideez Authenticator App and scan the QR code.
Confirm the login at the Hideez Authenticator.
Also, for some devices it is possible to scan the code directly from the smartphone camera, this will redirect you to Hideez Authenticator.