**Header Logo 

Just go to blogger Design and upload the logo image from header widget in page lements.

**Menu Links
Go to edit htmt and find for below codes

<ul class='menu sf-menu'>
<li class='current'><a href='#'>Home</a></li>
<li><a href='#'>About</a></li>
<li><a href='#'>Contact</a>
</li>
</ul>

Just edit the # with url and corresponding text with linking text to url.