I am trying to add a second, non-default, theme to our storefront. I read how to properly identify the templates, css, etc. in the configuration settings, and I have copied over what seems to be the correct folder structure for my new theme, but I didn't actually install anything. Is this a step I have missed? All I really did was add a new folder and use that folder's name in the config settings.
Can someone help me figure out what I've done wrong?