Hey Moltra, I'm not familiar with the mezzanine_editor app, as far as how it works or doesn't work, you may have more luck posting an issue with it's repo.
Blog posts are posts in the Mezzanine blog (so they are posted sequentially and paginated to split them up), i.e.
http://mezzanine.jupo.org/blog/. Pages reside in Mezzanine's page tree and are meant to be much more static, examples would be an About us page or a Contact page. I'm not sure if I answered your question, let me know what I can clarify more.