Position Block Below Content but Above Editor
Omega based themes still allow for custom regions and various *.tpl.php files. There is probably a node.tpl.php theme file in the base theme thats inherited by the subtheme your using.

The code doesnt go in the tpl.php file it goes in the preprocess function:


  How to display block in node above comments. What i have tried is:
  create region - regions[above_comments] = Above comments after in
  template.php i have added this to THEME_preprocess_node


You then output the correct block within the specific region of the theme. In the linked page they created a region called Above comments in their theme. They set a block to that region using the Blocks Admin UI and rendered it using block_get_blocks_by_region using the theme preprocess function.