For people who are struggling with the "unable to move, modify Mark-up setting" issue like me, I found a solution, or a work around. Apparently Event Page plugin doesn't like site URL to be different than the WP URL. At least in my case, when I set both url to be the same, Event Page functioned as expected. You may still get those permission errors but things should still work. Once I made the changes to the Mark-up setting, I then changed the site URL back to the root directory. Everything still works fine except you can't make the Mark-up changes. Hope this helps.