Step 1 – Go into the Layout > Edit HTML
/* Hide the Navigation Bar */
Step 2 – Look the Edit Screen
Step 3 -:
Copy the above code and paste here after the body class in the HTML as shown in the step 2 , however you do only if you know little about the html and style sheet.
After pasting the code , save the template and view the blog and you will be seeing that navigation bar is not displaying now.
To do the new post now you need to login in to the http://www.blogger.com/ and click dashboard to get into the your blog and new post.