Hi Alfredopacino,

For the login in the site, we use JA Login module: http://www.joomlart.com/forums/downloads.php?do=cat&id=448

To have the login module like this site, follow the steps below:

#1: define a position in header block (position "head-login"

Open header.php file (templates/t3_bs3_blank/tpls/blocks) then add the code to define "head-login" position.

<?php if ($this->countModules('head-login')) : ?>

    <!-- HEAD LOGIN -->

    <div class="span2<?php $this->_c('head-login')?>">     

      <div class="head-login">

        <jdoc:include type="modules" name="<?php $this->_p('head-login') ?>" style="raw" />

      </div>

    </div>

    <!-- //HEAD LOGIN -->

    <?php endif ?>

#2: install JA Login module, enable it, assign to all pages and assign to position "head-login"

#3: you may need to add some style to make it look good on your site.

Hope it will be helpful for you

Regards