Modify xzeroscripts Classifieds Script

Hi there, I have the following script - xzero classifieds script from [login to view URL], I need a small modification done to this script. Currently there is no member login system on this script, AD posters simply click post a ad, fill in the ad info and submit it, an email is sent to there email address, they open that email and click the link in that email and the ad gets automatically published for the period of time they chose. Now the problem is if they need to upgrade that ad to say featured / extended ad later on, they are unable to do that with the link from the email, the email link that was sent to confirm the ad also had another link to edit the ad, on the ad editing page, the user can only change the ad description, pictures, etc. But they cannot upgrade the ad to featured / extended ad and pay for it. When they first post the ad, they have this option to upgrade to featured but not when the ad is already posted. Please post an ad on [login to view URL] and try it out yourself so you can understand clearly what I mean. I need this sorted, Please bid only to fix the issue above, giving ad posters ability to upgrade there ad via that email link. ####################### Also please advise how much to setup a member login system / control panel on the site, so users can login into there account and manage all there ads and also for other users who want to save ads to there account so they can go over it later. Please advise your bid for the member login system separately by PM, as I will post another project on this if the price is OK. ####################### Escrow there for the right person with the right price. No advance payment. Dont ask ! Release of Escrow on job done. Thank you !