I set YES on Show BUY button on albums and fill the input on the form.

But the link doesn't appear.

So I change this:

<?php if($this->params->get('allowalbumbuy') && $this->album->buy_link != ""){ ?>

      <a href="/<?php echo $this->album->buy_link; ?>" title="<?php echo JText::_('BUY_THIS_ALBUM'); ?>" target="_blank"><?php echo JHTML::image('components/com_muscol/assets/images/buy.png','Buy'); ?></a>

      <?php } ?>

For this:

<a href="/<?php echo $this->album->buy_link; ?>" title="<?php echo JText::_('BUY_THIS_ALBUM'); ?>" target="_blank"><?php echo JHTML::image('components/com_muscol/assets/images/buy.png','Buy'); ?></a>

And nothing happens.