Switch to the Recipients view by clicking the Recipients tab along the top of the screen.
Select "Marketer List Database" to fill the To Mailing List field and select "All List Contacts" as the To List Group field.
List details of 3 sample contacts also with you entered at the first step will be displayed. Select one of the contacts and click the Preview Message button to preview what the personalized message you are about to send will look like in their inbox.