Wix Mail is an email service that allows you to use a professional email address with your own domain, fully integrated with your website.
In your ClouDNS account, you need to create a Master DNS Zone. If you do not know how to do it, you can check it here. When your Master DNS Zone is created, go to your DNS Zone Control Panel and find the "Records Templates" button, located between the "SOA settings" and "Cloud domains" buttons. Click on it.
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From the orange boxes, click on "Wix".

The following records will be added:

When you click on the "Activate template" button, the records will be added to your zone and the template will be activated. You can edit those records afterwards.