Custom Fields in Articles Anywhere is a Pro feature, so there's the first thing you need to address.
From there, you need to use the Custom field name to show the value of the custom field for that article.
If the custom field is called "Habitat" - that has a ...
According to a forum post in Joomla (link below), you could check to see if the Session Path Writable is set to NO. If the Session Path Writable is set to no, you will need to contact your hosting provider to change this.
Her is a link to a thread for the same problem: https://forum.joomla.org/viewtopic.php?t=971335