Your Zealder website runs on your own custom domain name, and you can host business-class email on that same domain. The @Domain section of the admin is where you manage both.
You can register a brand-new domain through Zealder, transfer in a domain you already own, or connect a domain that stays registered with your current provider. Once a domain is on your account, your website is published to it. See Add Domain Name and Manage Domains.
With your custom domain you can set up Zealder Email business-class mailboxes (for example, you@yourdomain.com) and create unlimited email aliases that forward to an existing address. See Zealder Email Hosting.
Permission required: Admin.