There's a small button with a pencil icon at the top of the page, click that to show the settings. If micropub is available on your site, it will be under the editor, to the right of the 'Post' button, otherwise it's just a button by itself.
Hi Jonathan, thanks for this post I really do share your vision for a unified reading and writing experience. I've been working on it for years, and would work on it full time if my resources would allow. unicyclic.com isn't as polished as it could be yet, but it is good enough for me to use as the primary way to interact with the feeds I follow, and it's open to others to try. Combined with snarfed'stwitter-atom.appspot.com and facebook-atom.appspot.com it also covers my requirements for interacting with silo users.
cool, let me know if you do any work on it! I think it would be pretty fun to try out, but I would probably wait to see what you came up with before looking at it myself. :-)