Hello.
1) Create an email with your domain on the hosting. Here are the instructions https://www.crazydomains.com/help/article/create-email If this did not help you, please contact your hosting technical support.
2) Set up email in the program. Here are the instructions https://guide.websitex5.com/en/support/solutions/articles/44002250553-e-mails-how-to-set-them-up-so-they-can-be-sent-from-the-website
I recommend using SMTP to send emails.

P.S. In my paid video tutorials you will find an example of setting up email.