lament-configuration/templates/add_user.mustache

<div class="config-pane">
  Sign up using invite code {{token}}.
  <form name="new-user" method="POST">
    <div>
      <label for="username">Username</label>
      <input name="username" type="text" />
    </div>
    <div>
      <label for="n1">Password</label>
      <input name="n1" type="password" />
    </div>
    <div>
      <label for="n2">Retype password</label>
      <input name="n2" type="password" />
    </div>
    <div>
      <input type="submit" value="Sign up" />
    </div>
  </form>
</div>