If you're wondering why you cannot see the classifieds forums here, it's because you don't have full access.
Full access is given when you have been a member for 60 days and made 25 non-spammy posts.
Access is then kept by contributing to the community by posting at least 50% of your contributions to discussions outside the classifieds. This change was introduced in August 2015 to encourage community growth and fair contribution for all.
Please see this thread for more information.