Recently I installed Joomla CMS on Starmoo and had one problem.  Instead of the default address being www.starmoo.com, it was starmoo.com.  Due to canonical issues that has become a problem with Google (the only search engine that webmasters need to care about) because it may trigger a duplicate content penalty.

While we published several articles I wanted to resolve the problem before it became an issue.  Unfortunately, Joomla sets the default without the www and doesn't allow you to change it but I would strongly recommend that you do (there is a whole discusssion around 301 redirects but that is another story - more important for those websites that already have many already indexed pages).

How to change your setting?

Just go to the configuration.php file and open it in a notepad (make a backup copy in case you make a mistake).  Now find the line where your website may be listed as domain.com and change it to www.domain.com.  You should be done.  Just check the website now.