The admin panel is available by default at port 3003 . You have to setup a login and password to be able to sign in. This is not a user credential and is specific to the admin. Visit the Configuration section to setup your credentials.
User account creation
You can generate a valid link for an account creation. This is useful if you did not setup an email provider. Send this link to the user who wants to create an account and they will be able to go through the registration flow.