To install the AddOn, follow either of these instructions:
http://www.curse.com/content/AddonInstallGuide.aspx
http://www.wowinterface.com/forums/faq.php?faq=install#faq_howto_install

To configure the AddOn, simply edit the core.lua file (in any text editor) as instructed.

Thanks to Hershe of Silver Hand US for the concept and for testing and fixing my initial version.