troubleshoot my website

I have had work done on a site here: [login to view URL] The main issue is we tried to use a plugin I'll have to get the url for that, but it's basically based off this plugin [login to view URL] Anyway we can't get the 2 logins/signup to connect with the main site and the plugin. 2 it's too hard to modify the side search to add fields.. So we are going likely scrap it. We want the side search like [login to view URL]:homepage+Make It's a pity as it has a cool map view, if we scrap don't worry about that, but it also has the search page, search details page with a look just like the search page we have and the car details page. Plus we need a little admin for the seller. That plugin had it. So if you scrap it you'll have to put in some side search that is like that carmax links I sent, make a little seller admin, and slice up and put in the search page and car details page. Those looks of those pages are in this zip. Actually I'll have to find the car_details page. Also what's bad is we need a mini admin for the client to regulate seller/buyers. Seller profiles will need to be made as well. I have the design, but needs to be sliced up.