I recommend checking the administration first. The link will open a new window:
The login is admin and the password is demo. They are pre-populated so you don't really have to enter them.
The front-end is just a placeholder. If you install E.M.M.A. on your site you can completely revamp it and turn the front-end home into a sales page. Or you can decide to link directly to register/login pages from your other sales page, blog, or existing site. It's entirely up to you.
On the demo, you can register yourself in the front-end, or create an account from the administration and enable any subscription plans for it as you wish.
If you don't undertsnd something in the demo, or have suggestion, critique, or any other question, don't hesitate to contact me