Actually remove the navbar blogger (Navigation Bar) is an act that violates the TOS Blogger. But if you still want to do that, i tell you how to do :)

Use CSS script below :

/* CSS to hid navigation bar */
#navbar {
height:10px;
visibility:hidden;
display:none;
}


In edit HTML page, put the CSS script above after <b:skin><![CDATA[/* code and save template. DONE :D

source : http://www.o-om.com/2008/03/cara-menghilangkan-navbar-blogger.html