Dumb question - how do I actually run a single report?

I've been slowly working to upgrade our database 9i and forms/reports 6i to 12c, finally up to the Reports.

I have installed Forms and Reports 12c primarily based on the instructions here https://oracle-base.com/articles/12c/oracle-forms-and-reports-12c-create-new-domain#important-urls

To run Forms I am using the Forms Standalone launcher which works OK. I configured a config called standaloneapp_cctg and have a menu called mainmenu.fmx in the FORMS_PATH

java -jar frmsal.jar -url "http://apollo:9001/forms/frmservlet?config=standaloneapp_cctg&form=mainmenu.fmx"

The Oracle-Base page says I should have these two URLs but either work (hostname is apollo). I can access the server on port 7777 but the URLs both return 404.