For the To address, click the lightning bolt icon and select the email address column from the form.
the SMTP server settings depend on your host. Many hosts will work if you leave the smtp server settings blank. For some, you will need to enter the correct SMTP server address. For Others, you will need to use the Pear Mail for SMTP email object. there is no one set of instructions for the SMTP server settings that will work for all.
Who is your host? they probably have a support doc that has information on sending emails using a php script that will help in determining the correct settings to use.
for the email body, you can select the option to Create a File For the email message, this will include all of the registration information in the email massage.
if you do not want to include the all of the registration form data, dont click the create a file for the email body option, instead, click the DW Edit Icon to create your email message. On the bindings panel, expand the registration form binding group and the bindings for the fields you want to include in the email body.