How to enable OpenID for Joomla!

While the answer is extremely simple, time to time it takes too much time to figure it out what you need to get it done. Here is a checklist of what you need to make it happen: Joomla! version.  It should be Joomla! 1.5.20 Stable [ senu takaa ] 18-July-2010 18:00 GMT PHP version. It should be PHP5, BUT not 5.3 OpenId PHP library included in Joomla! OpenID plugin is somehow incompatible with PHP 5.3 OpenID plugin should be enabled: It is not worked now with new version then if you want it then please use other extension for that.