AnthonyWeb: I used the command configure_edison --setup. This configures the wifi, the password and there is something in there that enables the sshd server.
Rui: The password requirement was enabled due security requests, otherwise anyone can access any Edison board anywhere. You can of course hack your board to bypass it, but there should be a warning notice that's at your own risk. It's one thing at the security of your home lan, another is a product in the market.