Are you able to get any of the emails from your PowerStore installation? There should be emails that are sent when you register or for verifying your email address after registering. If you are not getting these emails either then there might be a problem with the values that you are using for the mail server. This is set in the admin area under settings > site. This value needs to be set to a valid SMTP server for your hosting. If you are not getting any emails then this value might need to be updated, you should check with your host to ensure that you have the correct value entered here.