At this moment in time you can only offer your services if you are a blogger. If you need services or products then anyone can make that request. Right now I don’t want every Tom, Dick and Marketer to hoc their stuff. These classifieds are not to advertise your timeshare, or your estate business, or whether you’re selling Kim Kardashian Toiletries. It’s a service offered to bloggers mainly.
In order to list your classifieds, you have to register as a member of this site. Once logged in you will see your member panel, where you can start uploading your listings.
Read this blog post for more info. Free Classifieds for bloggers