I got really confused trying to cleanup blogs after I cloned a MonoX project into a new one, because:
1) at normal UI (not in special admin UI), although I was admin I couldn't find some button to delete a blog
2) going to Blogs from Admin UI I couldn't find any blogs. It was taking me to /MonoX/Admin/BlogManager.aspx
I had to use the Blogs menu shown there (not obvious I should even try to open that menu, plus if I click it and don't hover over it [no touch screen support obviously], it will always go to blog posts list) and select blog settings to go to /MonoX/Admin/BlogSettingsManager.aspx. I'd prefer to have been taken to the 2nd one in the first place. Anyway, the Blogs page should have a button/link at the bottom I think to take you to the list of all blogs (the one called blogs settings), since it isn't obvious there is such a thing and that you have to find it from the menu. Note that I had already removed all blog posts from the normal UI (just couldn't find how to remove the blogs themselves too since at their settings pages there was no button to delete them), so at the admin UI for blogs I was seeing an empty table saying "No blog posts can be found!"