You might want to look at this https://omegaforums.net/threads/sales-rules-follow-this-or-your-ad-will-be-deleted.16607/ And https://omegaforums.net/threads/please-read-new-security-measures-for-the-sales-sections.16995/
As you don't have 200 posts yet, you won't be able to create a "for sale" thread without moderator permission. THe mod is @DLT222 he can give you the OK. As per the second thread: If you need to reach out to any forum moderator please feel free to do so with any questions you might have. If you feel you have listed items and you can no longer see these listings and have feedback to which we can manually add you to these forums please let us know, the feedback has to be from THIS FORUM with FORUM MEMBERS. We will look at your feedback and decide appropriately. This is for under 200 posts.