Proper way to list classifieds

HI everyone,
Its been awhile since I've used HGF.net I was searching the site and couldn't find (if allowed) the proper way to list a firearm for sale. Is it allowed on the site? If someone can direct me to the link/thread that would be great, or, "No, it's not allowed" is good too. Its a HK UPS 40 by the the way

Look under the banner AD at the top of the page, you'll see a link for "The Market Place".