326274 Used cars - add features

Hello, I already have a website with used cars classifieds and i want to add few more features. The site is build with Smarty, PHP and MyAQL and the previous developer was russian, so a lot of comments are in russian language. I want to let people to place cars without subscription, they will simply get in their mailbox a link and they can open a temporary session to edit their add. Also, if the user have multiple ads but no membership, i want to be able to create a member account and then to import his ads in his new account. For some pages i need more info to be displayed, and also a search by state/city, etc I'll provide every single page, no design or html/css code is not required.