See this Joomla Forum topic if you have questions: http://forum.joomla.org/viewtopic.php?p=2229886

Clearing / Deleting Joomla Cache
If you need to make changes to your site BEFORE the cache time expires, you must delete the cache before your changes appear on the site.
- From the Joomla Admin, select Tools > Clean Cache.
- If you have modified only articles, just select com_content and click Delete.Note: You won’t do any harm be deleting all the cache files.
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