My website only loads without the www prefix.

Try emptying your browser's cache and clearing your cookies (you can Google how to do this for your specific browser.) then trying again. If that doesn't help (and you've waited a while, sometimes up to a couple days, since registering the domain and setting up your hosting account) then there might be some settings you need to change in your host settings, and I'd probably recommend chatting to their support about that.

Have your registered "www. your website .com" as a subdomain? That's all "www" really is, and has to be registered to point to your website .com if you want it to work.

Hope that works for you.

You need to add www to your DNS zone file. Depending on how your file is already set up, you will need to use either an A record or a CNAME record, depending on how your web server is listed in your DNS record. My guess is that you just have your origin $ORIGIN yourdomain.com, several NS and MX records, and one A record that lists only an IP address. Something like this:

IN A 123.123.123.123

If that is the case, you can probably just add something like this:

www IN A 123.123.123.123

If you already have an A record pointing to your web server, you can use a CNAME to alias it. For instance, if you already had:

webserver IN A 123.123.123.123

You could use:

www IN CNAME webserver

Hopefully this will at least point you in the right direction. You probably want to consult the documentation of the company you have your domain name registered with. They probably have something that will explain the specifics of how to go about doing this.

Okay, thanks guys! I think I have it figured out now.