So what if you don't need it? or the design of the navigation bar contradict your blog's design?
Here is the solution to get rid of that navigation bar. Go to "Layout" and click "Edit HTML" tab then paste this simple 3 lines code which is CSS (Cascading Style Sheets) before the #header_wrapper code.
#navbar {
display:none;
}
Click "SAVE TEMPLATE" and your done. Refresh the browser to see the results.