Hide or remove your Blogger.com NAVBAR on top of your blog just copy and past the following codes on your Blog Edit page.
For blogger CSS style users it means classic users past the following code.Note copy and past the following code in between the "CSS style".
#b-navbar {
height:0px;
visibility:hidden;
display:none
}
For new Blogger users it means Blogger beta style users past the following code:
#navbar-iframe {
height:0px;
visibility:hidden;
display:none;
}