Remove Navigation bar from your blog

1 . Backup your template for safety issues.
2 . Go to Dashboard > Template > Edit HTML
3 . Check the box of Expand Widget Template .
4 . Find the following code by pressing Ctrl + f
     </head>
Replace it with the code given below.
<style type="text/css">
    #navbar-iframe {   height:0px;   visibility:hidden;   display:none   }
    </style></head>
5 . Save your template.