Want another address besides username@your-domain.tld? Easy:
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Go to your dashboard → Email > Domain > Mailboxes.
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Edit the user, add the alias, save.
Depending on the Webmail, you can then set it up there as well (this is for Snappy Mail):
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Log into webmail (e.g. https://mail.your-domain.tld).
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Bottom left → Settings (gear icon).
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Go to Accounts → Add Identity.
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Enter alias address + display name, click Add.
Drag your alias to the top to make it the default sender.