How to edit Menu on my new template?

In general, to edit the Menu, you have to do that through Edit HTML, as follow:
Login → Layout → Edit HTML

Then find the code similar to:

<li><a href='/'>Home</a></li>
<li><a href='#'>About</a></li>
<li><a href='#'>Post RSS</a></li>
<li><a href='#'>Comment RSS</a></li>
<li><a href='#'>Edit</a></li>

To add your own links to the Menu, simply change the symbol # with your own links.

Or find the code similar to:

<li class='current'><a expr:href='data:blog.homepageUrl'>Home</a></li>
<li><a expr:href='data:blog.homepageUrl + &quot;feeds/posts/default&quot;'>Posts RSS</a></li>
<li><a expr:href='data:blog.homepageUrl + &quot;feeds/comments/default&quot;'>Comments RSS</a></li>
<li><a href='#'>Edit</a></li>

Then you can change expr:href=’…’ with your own links such as href=’mylink’. Or for more complete information, you can read the instructions of the template you choose.

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?