Ruby on Rails

i have a problem integrating bootstrap to the rails . i followed the instructions given this link http://stackoverflow.com/questions/18371318/installing-bootstrap-3-on-rails-app

and not able to load a navigation bar with this bootstrap snippet

<nav class="navbar navbar-inverse">

  <div class="container-fluid">

    <div class="navbar-header">

      <a class="navbar-brand" href="#">WebSiteName</a>

    </div>

    <ul class="nav navbar-nav">

      <li class="active"><a href="#">Home</a></li>

      <li><a href="#">Page 1</a></li>

      <li><a href="#">Page 2</a></li>

    </ul>

    <ul class="nav navbar-nav navbar-right">

      <li><a href="#"><span class="glyphicon glyphicon-user"></span> Sign Up</a></li>

      <li><a href="#"><span class="glyphicon glyphicon-log-in"></span> Login</a></li>

    </ul>

  </div>

</nav>

can somebody help fix it