The directions that I've found for adding a node to a block indicate that there should be a "Nodes in block" tab on the vertical menu on the node edit page. In the 'Nodes in block' configuration page, I've enabled every single content type and defined them all as available for the block. When I edit an existing node or create a new piece of content, there is no option to add the node to the block. There is nothing showing up in the nodes in block queue either, and the block is not showing up page either. I tried flushing the caches. Am I missing something here?