Hello,
Are you using services from https://wordpress.com or are you using a self-hosted WordPress installation from https://www.ads-software.com ? There are large differences between the two websites.
If using https://wordpress.com then you can setup email forwarding, but there is no native email functionality. This means you can setup mail such as [email protected], and mail sent there will simply forward to say a Gmail account.
Learn more here: https://en.support.wordpress.com/add-email/
If you are self hosting with a provider such as Go Daddy, Bluehost, InMotion, etc, then you will need to contact your hosting provider for assistance with setting up emails.
WordPress is CMS / blog software and does not provide features such as mailing inboxes. Those features are provided by hosting companies and mail solutions such as Google Apps For Business.
In short if you want full featured email contact your hosting provider or enlist services such as Google Apps For Business. I advise consulting with a technical specialist if you are not sure how to handle setup.
Hope you find this helpful!