How do I edit a single listing on the front page?

I added 2 more ‘submission’ custom field that I wanted extra (but you can add more), you decide on order it displays.
I added fields to be displayed in order I want that are related to listings and limited by listing price: free, basic, featured. They are being displayed to those who click on listing package ( some are required -your choice – some are not -you decide ).
When I add listings from front end or edit listing from front, I turn all fields as not required, so I can edit my listings from front end and when I’m done on that day, I turn some fields back on to be required for others who visit my site.
I did not change default registration fields, because I found the information already included was the most basic I wanted anyway.