Hi Rodrigo,
This need some customization on header page. You can create new position on header and assign right logo to this position.
+ Open templates/ja_mero/tpls/blocks/header.php file
from
<!-- LOGO -->
<div class="span8">
<div class="logo logo-<?php echo $logotype ?>">
<h1>
<a href="<?php echo JURI::base(true) ?>" title="<?php echo strip_tags($sitename) ?>"<?php echo $logoimage ?>>
<span><?php echo $sitename ?></span>
</a>
<small class="site-slogan hidden-phone"><?php echo $slogan ?></small>
</h1>
</div>
</div>
<!-- //LOGO -->
change to
<!-- LOGO -->
<div class="span8">
<div class="logo logo-<?php echo $logotype ?>">
<h1>
<a href="<?php echo JURI::base(true) ?>" title="<?php echo strip_tags($sitename) ?>"<?php echo $logoimage ?>>
<span><?php echo $sitename ?></span>
</a>
<small class="site-slogan hidden-phone"><?php echo $slogan ?></small>
</h1>
</div>
</div>
<!-- //LOGO -->
<?php if ($this->countModules('right_logo')) : ?>
<!-- right_logo -->
<div class="span4 pull-right">
<jdoc:include type="modules" name="<?php $this->_p('right_logo') ?>" style="raw" />
</div>
<!-- //right_logo -->
+ Create new module and assign it to right_logo position
Regards