Can't find Additional Fields in Appointments+

Hi, I've added Additional Fields add-on to the Appointments+ plugin and I can't find anything anywhere how to use it or any change to the UI. What few items I have found in the WPMUDev forums mention General Settings but I can't seem to find anything in the Appointments+ general settings or Wordpress General settings. I've tried refreshing pages, logging out and back in and even other browsers but can't find anything. I can't find any documentation either. Can you please help me to understand what I'm supposed to do?
I'm on the most recent version of wordpress and am up to date with the plugins. I've tried disabling all plugins, all to no avail. Support is open for you to take a look if you need it.