Classipress customization

Hello, 1- I have a classipress wordpress website and when users want to list an ad they get this error message 'Your session has expired or you are trying to submit a duplicate ad', I need to know it is due to what? and to fix it? They are talking about this problem here [login to view URL] 2- I also want to make ads featured by default, and add (highly recommended) in the text near the featured checkbox in the selling form. 3- Add adword code to my payment landing page. 4- Add pagination 5- Add adsense code under the selling form information in the ad page (ex: [login to view URL]) Please bid only if you have account in appthemes website and have already worked on classipress them, and know exactly where the issue n1 comes from. Thank you