I am making a WordPress website and am pretty new to the whole experience. I am trying to figure out how to disable a 'Register' button on a page when the Product quantity (Woocommerce) is 0. The button redirects them to a registration page before they can purchase. Obviously if the quantity is 0 I don't want them to get to that page and I want that button disabled. I have looked at other examples but frankly I'm lost on what I need to have as far as code and even where to put it.
Please help give me an idea of what I need. Thanks