On the Elite machines using the Masso controller, entering F1 screen requires a password (as these values should not be changed unless you are a ‘power’ user.
The password will be blank and you just hit the enter button.
If not, it will be HTG.
(If HTG is the password, it means you do not have the Onefinity Factory Default values on your machine. Please reload them here: Elite Series Masso Default Machine Settings)
See more here (changing elite masso password): Admin and User Passwords.