this is what it says from here: https://forum.xat.com/announcement/2-frequently-asked-questions/
I forgot my email! What do I do?
Create a new xat account and open a ticket. Select the Lost Access help topic. The subject should be at least five words. In the ticket, include the username and identification number (if known) of the account you need help with. You will receive an email with a link to the ticket, but only at the email for the new xat account. Eventually when the email is changed you will be able to reset the password.
Anyway, I already asked to a volunteer, so thanks