There are many ways to force www/non www, but this way requires to create/edit .htaccess file (htdocs/.htaccess or yoursite.dom/htdocs/.htaccess)
Forcing away from www.
RewriteEngine on
RewriteCond %{HTTP_HOST} ^www.yoursite.dom [NC]
RewriteRule ^(.*)$ http://yoursite.dom/$1 [L,R=301]
^^ changing that to https forces away from www. and also forces https encryption
Forcing to www.
Its basically the same thingNOTE: If you are using a Free Subdomain like
site.rf.gd, DON’T USE THIS!
RewriteEngine on
RewriteCond %{HTTP_HOST} ^yoursite.dom [NC]
RewriteRule ^(.*)$ http://www.yoursite.dom/$1 [L,R=301,NC]
^^ changing that to https forces www. and also forces https encryption