To remove your Blogger nav bar, just use your web browser and login to your blogger site account. Once you are on your Blogger Dashboard, click on the design link to take you to your Blogger website layout page.
Then clink on the “edite html” link and you will be link to a page full of html script in an iframe mode i.e inline frame mode.
Note: make sure you did not either delete or temper with any code in there, to avoid your blogger site template to be spoilt. That is if you are only using blogger template and not an external template being imported to blogger
