NOTE: The BMLT plugin does not yet support Joomla 3.0. It supports Joomla 2.5 and below.
First, fetch the plugin as a zip file (Don’t unzip it). Then, view this video for installation and activation instructions. Once you have the component and plugins installed, go to the BMLT settings, and read this page for guidance on administering the plugin.
Once the plugin is set up, then read this page to get guidance on how to make the BMLT instances appear in your articles. You can also specify the BMLT component, by adding “?option=com_bmlt” to the main site URL. That will open up a page with the “classic” interactive BMLT display, based on the first (default) settings.
You may also want to look at these pages for ideas and examples. They demonstrate WordPress plugins, but the process is almost exactly the same for Joomla! and Drupal.