How to uninstall a plugin in Joomla 2.5?
If you want to uninstall an external plugin in Joomla 2.5 you should navigate to the Joomla 2.5 admin area -> Extensions -> Extension Manager.
Open the Manage tab. Select Plugin from the Select Type drop-down menu. Search for the chosen plugin in the filtered results and click on the check box besides it. Find the Uninstall icon in the upper right Joomla 2.5 menu and click on it to completely remove the chosen plugin.
Note that the Joomla 2.5 core plugin can not be uninstalled.
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