I just updated the website with a couple of small features:
Allow publishing unlisted posts. This means that you can upload your craft, etc as unlisted and then publish it from its details page at a later time. This will allow you to edit the description in your web browser prior to publishing so you can make sure it is exactly how you want it to look when it is first available for other players to see. When you do publish, the post will then update its publish date so that it will be considered a new post. This works for crafts, sandboxes, planetary systems, and celestial body posts.
You can now add Contributors to your Planetary System and Celestial Body posts, so they will have their name displayed at the top of the post and receive points for upvotes. Also, when you upload a new version of a celestial body or planetary system, all contributors on your previous post will be automatically carried forward to your new post.