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you need to change the theme template if you want to put the blocks below your page content. however by doing that, the blocks will always be shown below the content in all pages.
there is a stting in the blocks admin, where do we want to show the blocks are (probably at the moment you have set them to be shown in 'all pages'). use ctrl-click to select multiple items.
what do you mean my losing your top poster block?
you should be able to make it visible again through the 'block admin' page (go to your admin page > system -> blocks).
btw, try to use this module:
blockadmin, it's really great for managing your blocks and module access privilege.