"We are requesting that you spend some time with us before you start a For Sale thread. 20 posts will be the minimum requirement or 1 year since creating the account + an intro thread (just so we know you aren’t the Prince of Africa)."

Spend some time around first, and just go to the for sale - parts section and post a new thread once you are able to.
http://www.grandprixforums.net/showthread.php?t=38