Only if the account has the Digital Asset Manager functionality enabled will the interface load; otherwise, it will reroute to a website index. The Stylesheet controls show up with pre-filled settings when the page loads. This is the active screen, as shown by the control on the left. On the left-hand column, more control sets are displayed and clickable.

A user could see public website using the View button after saving the CSS content. Navigate the page source to find your customized CSS. It ought to be visible on both the home page and a model interior page.