Step 1: Login to the cPanel account.
Step 2: Navigate to the section Files > File Manager menu.
Step 3: Select the .htaccess file and right click on it.
Step 4: Select ‘Edit’ option in the list.
Step 5: Enter the below rule to force non-www to www to your domain.
RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]
Step 6: Click ‘Save changes’ to complete the setup.
Click here to view this article as Oryon knowledge base video tutorial playlist.