register-form.tpl

<form class="register-form" action="/register">
  <input type="hidden" name="instance" value="UserRegister">
  <label for="user">Username</label>
  <input type="text" name="user">
  <label for="password">Password</label>
  <input type="password" name="password">
  <label for="user">Repeat Password</label>
  <input type="password" name="passwordConfirmation">
  <input class="submit" type="submit" value="Register">
  <div class="status"></div>
</form>