Not Working with WWW or without WWW

If the plugin doesn't work with or without www, you must add a .htaccess rule into your wordpress .htacess file.

From www to non www :

 RewriteCond %{HTTP_HOST} ^www.(.*)$ [NC] 
RewriteRule ^(.*)$ http://%1/$1 [R=301,L]

From non www to www :

RewriteCond %{HTTP_HOST} !^www. 
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]