Simple WWW Redirect
The plugin specifies whether your domain will include www. Redirects www to non-www or non-www to www.
Add www to your domain, redirect non-www links to www
Or redirect www links to non-www
A simple lightweight plugin
Install Simple WWW Redirect just as you would any other WP Plugin:
Simple WWW Redirect from WordPress.org.
Unzip the .zip file.
Upload the Plugin folder (Simple-www-redirect/) to the wp-content/plugins folder.
Go to Plugins Admin Panel and find the newly uploaded plugin, “Simple WWW Redirect” in the list.
Click Activate Plugin to activate it.
Go to WordPress Admin > Settings > Simple www redirect.