Log-in to Plesk at http://my.homepageuniverse.com/hosting [Link: http://my.homepageuniverse.com/hosting]. Click on Mail. Supply in your desired username and password. Your username will be the name of the email address that you want mails to send to, example: if your username is webmaster, then you will have an email address of webmaster@yourname.com, and so on.

 

You can see a tutorial on this issue at http://homepageuniverse.com/support/tutorials.php