Power store uses the php mail() function for sending the email, the mail() function does not offer support for passing a username and password to the server.
you set the smtp server on the first page, but the Registration Email and Store Email tabs are you define the email from address. In many cases the from address must be a valid email on the same domain as the SMTP server.
who is your host? the SMTP server looks like a godaddy server.
If you are using godaddy, you will need to ensure that your hosting package is a linux hosting package, GoDaddy is notoriously difficult for sending emails using a php script, and they do not support the php mail() function on their windows hosting plans.