The newsletter subscription form on my homepage (https://thecontrastclub.com) shows an action with http instead of https and I am obviously getting the insecure warning from the browsers. How can I change this without uninstalling the plugin? Everything else on the site is https, and yes, I have a proper SSL certificate. I have had some mixed content issues, so this might be leftovers from that, but is there a way to fix this? I can’t find a way through the dashboard and I would not know where to start on the backend.