there are many solutions to disable, hide or remove Navbar from your blog
first you have to take the common steps to make any changes in html codes
go to Design > Edit layout > Edit HTML then check the checkbox to expand the widget template .
(Hint) before you edit your template, save a copy of it.using Download Full Template option
if you want to disable or hide navbar without deleting it then do 1st or 2nd method
and if you want to remove it completely use method 3rd
1st method :-
search for the code
]]<b:skin>
and replace it with
#navbar-iframe,#navbar { display: none !important; }
]]<b:skin>
2nd method :-
search fore the code <b:skin>
& replace it with the following code
In the Template Code find
and just above that add the following Code.
<b:skin>
#navbar-iframe {
height:0px;
visibility:hidden;
display:none
}
3rd method :-
is to remove the navbar completely as follows
<body>
and just above that add the following Code.
<!--<body>-->
the following message will appear
 |
| navbar1 deletion message |
choose delete widget and your done
(Hint!) You will not be able any more to see the Quick Edit pencil 
or wrench links 
,You also wont see the Comment Delete icon near your comments even if you are logged in but it doesn`t matter since you still can change your elements from your dashboard
Update! : Blogger navbar now can be turned off directly from layout just go to layout then go to navbar and choose OFF option.
or wrench links ,You also wont see the Comment Delete icon near your comments even if you are logged in but it doesn`t matter since you still can change your elements from your dashboardUpdate! : Blogger navbar now can be turned off directly from layout just go to layout then go to navbar and choose OFF option.
blogger hacks navbar