Give the old e-mail you signed up with. Give the new (non-free) e-mail you want it changed to. It's a good idea to include the handle you signed up with, if you remember it.
Someone can then change it for you and send out a new password.
It has to be a non-free e-mail, like sign-up, since you have not logged into your account yet.
____________
"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."
Only fools and children dream of heroes.