I understand that the shortcode would be available from 3.9.0 onwards. And I have the 3.8.6 version installed.
But I have some questions to ask. Is the shortcode function fully ready to use or is it still in beta? Is there any clearer guide available to test out? The one at the website seems to be confused. Where will I apply the CSS shortcode, when there is the button label shortcode?
And does the subscription form shortcode allow the subscriber to register and add to the list without any preferred list? (to build up subscriber list in WordPress)
By default, the shortcode comes with the button inserted already? Or do I need to add the code for the button?