1.  In Blogger, click on Template

  2.  Click on Edit HTML

  3.  Click Proceed

  4.  Check the box for Expand Widget Templates

  5.  Search for the following word: Attribution1
  6.  Remove the entire <b:widget> tag

  7.  Click Save template

  8.  Click Delete widgets

  9.  Click Close


The following video demonstrates how to remove Powered by Blogger:

https://www.youtube.com/watch?feature=player_embedded&v=4-OBvEYbQ_g