I installed this theme http://shakenandstirredweb.com/theme/easy-docs
but I don't understand how it works: after install I have only page menu, post menu has disappeared. Page only appears as menu not as content. So how does it work ?
not sure if you watched the video on their site, because that seems pretty self-explanatory (especially from 1:18 onwards) It also says clearly on the site that it is a one page and very basic theme:
So if you are looking for how to add Posts that are not "Sections", then you have perhaps downloaded the wrong theme?