The testing has been completed and a new version of the Classifieds will be released sometime in June. In the meantime you can still post your ads on this site but currently you will not be able to add your logo or an image.
However, if you have a prior ad with your logo it is recommended that you re-post that ad and edit\update the content. Here is a link to the FAQ question about re-posting ads. FAQ on Re-posting Ads