Cannot redirect to www

Hi!
I just installed WordPress on my webserver.

I’d like to know how to redirect people who type https://example.com/ to https://www.example.com/. I know pros say that only newbies want to do that, but I’d like to know how to do it.

Some minutes ago I was reading this post that said a fresh installation of WordPress can redirect to https://www.example.com/ without making any changes, but I don’t know how to do it.

I also tried modifying my .htaccess file. I added this:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP_HOST} !^www.domain.com$ [NC]
RewriteRule ^(.*)$ https://www.domain.com/$1 [R=301,QSA,L]
</IfModule>

, but now it shows the “page not found” message.

In Settings > General I changed Blog Address to https://www.example.com/, but nothing.

Any help is greatly appreciated.