1. Login to Blogger > Select Blog > Design > Go to Edit HTML > Expand Widget Templates.

2. add widget HTML AND JAVASCRIPT / copy and paste this code

Find some code with ctr-f

<div class='clearfix' id='menu-wrapper'>
<ul class='sf-menu dropdown'>
<li class='selected'><a expr:href='data:blog.homepageUrl'>Home</a></li>
<li><a href='#'>Dropdown</a>
<ul class='sub-menu'>
<li><a href='#'>Advanced</a></li>
<li><a href='#'>Design</a></li>
<li><a href='#'>Development</a></li>
<li><a href='#'>Typography</a></li>
<li><a href='#'>Photography</a></li>
</ul>
</li>
<li><a href='#'>Testing Element</a></li>
<li><a href='#'>Another Options</a>
<ul class='sub-menu'>
<li><a href='#'>Option 1</a></li>
<li><a href='#'>Option 2</a></li>
<li><a href='#'>Option 3</a></li>
<li><a href='#'>Option 4</a></li>
<li><a href='#'>Option 5</a></li>
</ul></li>
<li><a href='http://blogtemplate4u.com'>Portfolio</a></li>
<li><a href='http://blogtemplate4u.com'>Download</a></li>
</ul>
</div>


3. After found all link you can change link and description
