I received a warning that my e-mail address already exists in the system  the warning indicates that your e-mail address has been used in the past to register in the system. If you have forgotten your password, please use the [I forgot my password] link on the login screen. If you have registered in the past, you only need to enter/reset your password, with no need of registering again.    
 can I use my e-mail address as my login?  yes, it’s a common practice.    
 What does the "*" sign next to a text box stand for?  The "*" sign next to a text box means that it must not be left blank.    
 other registration problem  we’re happy to help, please contact
 pomoc@exposupport.pl for more assistance.