All users setup on your account appear on the left side of the page. Check off each user that needs to receive a test message. If the user is not listed, enter their email address in the text box on the right side of the page. When finished, select the Send Test Message button.
This sends you a copy of the email. Within the subject line and content of the email we note in red text that it is a test message with sampled data. Merge fields such as [FirstName] or [LastName] used within the email will populate the contact information of a random contact in your mailing list.