Remove Nav bar

Q: How do I remove the Nav Bar from my blog?
A: Design>template designer>Advanced>add CSS
Insert these codes:

#navbar-iframe{display:none!important}
header{margin-top:-40px}#

Hit the [enter] key once
Click [apply to blog]

All control tabs like [new post], [edit post] and [design] are now available on your dashboard.
If later on, you wish to reinstate the nav bar, just change your template:
design>template designer> template
select a different template
click :[apply to blog]

source: http://www.mccormickmadness.com/2011/04/cosmetics-for-your-blog.html