I'm setting up a JIRA demo to present to our engineers. The cascading custom field I've set up did not allow me to add the cascading topics. There isn't a 'settings' (gear) option on the Custom Fields screen, nor am I able to edit my home (default) screen.
The Configure option isn't there. I've noticed once you create a custom field, you cannot delete or modify it. I created a cascading field and it didn't give me to option to populate the cascaded fields. This is where I found out I couldn't delete or edit.