The file(s) you selected is/are attached. Furthermore, you have the opportunity to enter a "Subject" and an additional text in the e-mail body.
If you have not entered a fax number/E-Mail-Address by now, you can enter it manually in the "To"-field.
Click "Send" and the fax is sent
You can proceed the same way if you want to send e-mails or voice mails. Instead of selecting the service "FAX", select EMAIL or VOC.