How to re-display the lost “Blogger Navbar”?

Maybe you have found or downloaded templates that have added the CSS code to remove the blogger navbar, and you feel uncomfortable with it. Then you can re-display it by removing the code like above (CSS code to remove navbar).


All General Problem :

1. How to install blogger template?
2. How to remove “Blogger Navbar”?
3. How to re-display the lost “Blogger Navbar”?
4. How to edit Menu on my new template?
5. May I remove the credit link of the template?