template/xxxxx/footer.tpl
Il suffit d'ajouter du HTML voire d'ajouter des class= et de les définir dans les fichiers css.

Version de base de footer.tpl (Template yoga):

<div id="copyright">
<!-- BEGIN debug -->
{L_GEN_TIME} {debug.TIME} ({debug.NB_QUERIES} {L_SQL_QUERIES_IN} {debug.SQL_TIME}) -
<!-- END debug -->

<!-- Please, do not remove this copyright. If you really want to,
      contact us on http://phpwebgallery.net to find a solution on how
      to show the origin of the script...-->

  {L_POWERED_BY} <a href="http://www.phpwebgallery.net" class="back">PhpWebGallery</a>
  {VERSION}
  <!-- BEGIN contact -->
  - {L_SEND_MAIL}
  <a href="mailto:{contact.MAIL}?subject={L_TITLE_MAIL}">{lang:Webmaster}</a>
  <!-- END contact -->

</div> <!-- copyright -->
</div> <!-- the_page -->

</body>
</html>

Version modifiée de footer.tpl (Template yoga), par exemple:

<div id="copyright">
<!-- BEGIN debug -->
{L_GEN_TIME} {debug.TIME} ({debug.NB_QUERIES} {L_SQL_QUERIES_IN} {debug.SQL_TIME}) -
<!-- END debug -->

<!-- Please, do not remove this copyright. If you really want to,
      contact us on http://phpwebgallery.net to find a solution on how
      to show the origin of the script...-->

  {L_POWERED_BY} <a href="http://www.phpwebgallery.net" class="back">PhpWebGallery</a>
  {VERSION}
  <!-- BEGIN contact -->
  - {L_SEND_MAIL}
  <a href="mailto:{contact.MAIL}?subject={L_TITLE_MAIL}">{lang:Webmaster}</a>
  <!-- END contact -->
<br /><strong><a href="http://forum.phpwebgallery.net/profile.php?id=1227">VDigital</a></strong>
<br /><strong>PhpWebGallery Team</strong>
<br /><img src="http://forum.phpwebgallery.net/img/avatars/1227.jpg" width="44" height="60" alt="" />

</div> <!-- copyright -->
</div> <!-- the_page -->

</body>
</html>

Parfait, merci à tous.

Je cloture le poste.