As you know, at OneSite we give you all you need to put your website online, completely for free. But not all is about creating a website and putting it online. You'll also need an address, so people can access your site (ie. mycoolsite.com). This address is what's known as a domain name. Alright, regarding domain names, you can do different things:
Host a domain you already own.
If you registered a domain somewhere else, you can point it to our DNS and that's it! For that, go to your domain name registrar and click on "Edit DNS" or similar. Change the default DNS servers to:
Register a New Domain name.
You can also register a .COM / .NET / .ORG / .INFO / .US / .EU / .WEBSITE / .XYZ domain name directly through OneSite. The fee starts as low as €7 per year. It'll be automatically pointing to OneSite's Platform (you can also manually change it's DNS to point somewhere else if you wish later in time).