I know there's a kind of unethical bad habit of people posting "questions" that are in fact advertisements. This is not that. However, my problem is that I can't for the life of me figure out how to find anything on the marketplace, which would probably also be a potential buyer's problem, and I don't want to go through the hassle of uploading pictures and a narrative if it's pretty useless. I don't really understand how the marketplace works here, and I need some advice. I have just bought a brand new Bike Friday, and want to post for sale my old Bike Friday. How do I do that?