An email alias is an alternative name for your email account. To create an alias for your emails, open the Emails → domain name page → Email Accounts:
Click on the ⋮ button and choose Manage Alias:
Click on Add new alias to enter a display name that will be shown as the sender and the alias for the email address:
Then, click on Create alias. That's it! Now you will be able to send and receive email to the primary address using this alias.