Here's what you need to know:
Email me at email@example.com if you can't post for some reason. Include your .x500 ID.
Anyone can comment on a post by clicking on "comments" underneath it. If your .x500 ID has been authorized, you can post to the board, edit previous posts, upload files, and make changes to the site by clicking "sign in to post or edit" (read the instruction on that page).