When the INSTAR SMTP preset is selected, just fill out your receiver email address (see below) and test & apply your settings.
Here you need to input the sender, the receivers, the subject as well as optional a short email text with a maximum 64 characters. The sender address should be in accordance with the SMTP server settings, though some email provider let you choose this field freely. As a recipient, you can enter multiple email addresses using the appropriate input fields. It is recommended to fill out the subject line and the email text body to avoid the mail to be caught by any spam guards in place.