Can't find any social share button
Have you set them in Options?
What do you mean by they don't get the grey button under the picture?
You can change the design using overrides for file /themes/default/_share.php or you can customise CSS class "nc-button".
This code responsible for button.
<a href="#" class="nc-button"> <i class="icon-share nc-margin-small-right"></i> <?php echo JText::_('COM_COMPETITION_SHARE'); ?> </a>
Just paste your own button like:
<div class="fb-share-button" data-href="<?php echo JUri::current(); ?>" data-type="box_count"></div>
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