Creating a custom Edit page style for Q&A Plugin returns a 404

I have successfully customized most of the pages for the Q&A Plugin here: http://cxdeveloper.staging.wpengine.com/questions

However, I am experiencing issues customizing the Edit page (editing existing questions). I get a 404 error.

I know that this is a generic error that is hard to diagnose but I would appreciate any help on customizing this particular page.