In order to get a positive contribution from you, so you can contribute to the forum in general, and not simply trade your wares, there is a 5 post minimum required to post in the Marketplace. This means if you have only 1, 2, 3, or 4 posts please do not advertise in the Marketplace. Your thread will be removed and you will likely receive a warning.
Please note that once you have met the 5 post requirement there will be a short delay before your account is updated and you are able to post in the advertising section. Usually this delay is around 1 hour.