Yes, you can access your website using the prefix "www". The "www" is simply a subdomain that is conventionally used to identify web servers. It is not required by any technical standard, but it is a widely recognized convention.
In short, you can access your website with or without the "www" prefix. It is simply a matter of personal preference.
Here are the tutorials I have followed to set redirects with or without www.
Via cPanel: https://www.milesweb.co.uk/hosting-faqs/redirect-www-non-www-urls-htaccess-cpanel/
Via DirectAdmin: https://www.milesweb.co.uk/hosting-faqs/redirect-www-non-www-urls-htaccess-directadmin/
