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Mailboxes are created from Account → Mailboxes, against any domain you've already added.
Provide the local part of the address (the part before the @), pick the domain, and set a password. Two more fields are optional but recommended:
The mailbox is ready to send and receive mail immediately, and can be used with the built-in webmail client, or any IMAP/JMAP mail app - see Getting started for how autoconfiguration finds the right server settings automatically in most mail clients.
As soon as a mailbox is created, a default email signature is built from its full name and job title, combined with your domain's company details - see Signatures. This happens once, at creation time; the person using the mailbox is free to edit or replace it afterward from webmail Settings.
Contact support to disable a mailbox that's no longer needed (for example, someone has left the company) - mail addressed to it can continue to be forwarded or archived without leaving it open to login.