In order to create a new e-mail account on your domain you have to start by logging in to your cPanel.
If you are unsure about how to login to cPanel check this link
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When you've logged in, find the "Email" section and press "Email accounts"

When you add a new account, you only need to type in the actual name of the e-mail adress.
The "@" and domain will be automatically filled in by the system, you can also choose to create e-mail accounts on more than 1 domain under the "Domain" list.
And then just press "Create account" and you new account is created.
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