Are you talking about a forum or subdomain?

If {subdomain}
Do_action {Complain or ask help from an administrator}
Go to Private Messages and PM Nokia Since he is best person to ask questions and get an answer from.

if {Forum}
Do_action {Go to Administration Panel: Configuration}
Scroll to the bottom of the configuration where it says Email address and signature, you can change it from there, if you want to change your own email address go to {$yoursite.netfreehost.com/profile.php} and change it there.

Well your a 1337webmaster I sopose you can understand what that means.