Priority Prospect

If you wish to redirect your domain from non-www to www, place following code to your .htaccess file which you can find from your domain's root directory:

RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ https://www.your-domain-goes-here.com/$1 [R=301,L]

If you wish to redirect your domain from www to non-www, place following code to your .htaccess file:

RewriteEngine On
RewriteCond %{HTTP_HOST} ^www\.
RewriteRule ^(.*)$ https://your-domain-goes-here.com/$1 [R=301,L]

If RewriteEngine On already exists in your .htaccess file, you may remove it.

This example uses https:// protocol. If your domain does not use https, change it to http://

Redirecting using domain redirects

If you don't wish to edit your .htaccess file you can add a non-www to www or vice versa redirect from the PBN dashboard.

Just click on "Actions" > "Misc" > "Domain Redirects" and turn on on the redirect you prefer either "Redirect to "WWW" - on (or) "Redirect to "non-WWW"  - on. 

You can use either the htaccess method or domain redirects method to set redirects for your domain.