I believe that I meet the requirements to use Marketplace, but still don't see how to post my used Kessils. Will the permissions show up automatically ?
You should be able to start a thread in the marketplace based on your join date and post count by going here.
Just remember, there are two required prefixes. One is your location (state) and the other is a description of the item. You'll find a drop down list of prefixes right above the box where you put the title of the thread.