As some blogger do not like to have the blogger Navbar on their blog to be shown, you can hide it from your blog. To do so, you just have to add a small of code on your blog.

1. First login your dashboard, select  Layout ---> Edit HTML ----> Expand Widget Templates
2. Replacing the following #nabar-iframe code with the current one. If it is not existing, paste the following #nabar-iframe code in the head tag

  #navbar-iframe {
  height:0px;
  visibility:hidden;
  display:none
  }
  

Now, the nav bar is hidden on your blog. If you have any problem, comment are welcome.