Drag HTML/JavaScript widget and drop it just under your Blog Header, as shown below,
To change the links, Edit this part of the HTML in all codes below,
<li><a href="#" ><span>Link 1</span></a></li>
<li><a href="#" ><span>Link 2</span></a></li>
<li><a href="#" ><span>Link 3</span></a></li>
<li><a href="#" ><span>Link 4</span></a></li>
<li><a href="#" ><span>Link 5</span></a></li>
<li><a href="#" ><span>Link 6</span></a></li>
<li><a href="#" ><span>Link 7</span></a></li>
Replace the hash(#) sign with your Page Links /URL and replace Link1, Link2, Link3 etc with your Page Titles. If you wish to add or delete a tab then simply add or delete this line,
<li><a href="#" ><span>Link n</span></a></li>
Finally do not forget to save and save. See the results on his blog.