Too many issues!!!!

I am not sure why I have so many issues using the Classifieds Responsive theme. I am going to start researching an alternative.

My users can’t edit their listings.
You can’t navigate all listings from page to page without getting a 404 error.
Listings are not submitting and not saving

Help seems to be hard to come by. Has anyone had these issues and found fixes? Your help is appreciated as I do not want to re-start, but will if I can’t get a resolution for my visitors. Thanks.

The website in case you want to test it out. http://www.PopeCountySwap.com