Using Nautdrafter there is are two options for loginlogging in: As a player through Steam or as a an anonymous spectator.
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Logging in as
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a Player
Click the "Login as player" button
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If you had not logged into Steam, once you have finished logging in through your browser, Nautdrafter should have automatically been notified and will take you to the next screen.
Joining as a
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Spectator
Click the "Continue as spectator" button
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No Steam account is required and Nautdrafter should display the next screen.
Login uses Steam webAPI and openID Web API and OpenID.