To Hide The Blogger Nav Bar

1- Log in to blogger

2- On your Dashboard, select Layout. This will take you to the Template tab. Click Edit HTML. Under the Edit Template section you will see you blog's HTML.

3- paste this CSS definition

#navbar-iframe {
display: none !important;
}

Just Below this

-----------------------------------------------
Blogger Template Style
Name: Rounders
Designer: Douglas Bowman
URL: http://www.stopdesign.com/
Date: 27 Feb 2004
Updated by: Blogger Team
----------------------------------------------- */

It Should Look like this

-----------------------------------------------
Blogger Template Style
Name: Rounders
Designer: Douglas Bowman
URL: http://www.stopdesign.com/
Date: 27 Feb 2004
Updated by: Blogger Team
----------------------------------------------- */
#navbar-iframe {
display: none !important;
}