The dragonflybsd.org website is a wiki (ikiwiki, to be exact) and any page on it can be edited.  You have to create an account, first, which only requires picking a username and password.

However!  If you have an account on leaf.dragonflybsd.org where it is hosted, you can check it out via git, edit any number of pages using your favorite editor, and commit it back and the pages will automatically rebuild.  The commit will even show up like any other change.