There are only a few steps to install the JsIFR3 plugin on your Joomla 1.5 website:
  1. Login to the backend of your website and navigate to Extensions - Install/Uninstall.
  2. Select the plugin file that you downloaded to your hard disc and click File Upload & Install.
  3. To set the necessary parameters navigate to Extensions - Plugin Manager and click the plugin's name (System - JsIFR3).
  4. Select a font and enable the plugin.