How to install a Joomla 2.5 plugin?
Select the Joomla 2.5 plugin which you plan to install. You can search for one in the Joomla extensions directory here and make sure that it is compatible with Joomla 2.5.
Download it on your local computer and log in your Joomla 2.5 admin area. Navigate to Extensions -> Extension Manager. Click on the Browse button, find the plugin archive file and click on Upload & Install.
Once the plugin is installed you can manage it from the Extensions -> Plugin Manager area.
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