Download and enable the current dev version of the Drupal BBB module
Enable BBB module
Configure BBB Settings at: admin/config/media/bigbluebutton by adding a Base URL and Security Salt value. You can get this value using the command "bbb-conf --salt" on your Big Blue Button server. (Note: It's important there is no trailing / on the URL you use.)
Create a new content type or edit an existing node type and check the options under "treat this node type as a meeting"
Create or edit a node of your new type and ensure the bigbluebutton settings are correct.