If you have know the password linked to your FAN, please visit https://myaccount.thefa.com where you can change your email address.
To do this, click on 'Sign in using FAN - you'll be re-directed to login with your FAN and password. Once logged in, you will be able to change your email address
If you don't know your FAN, click on 'I don't know my FAN'
You'll then be asked to enter some details, after which you will be shown part of the email address that you have registered which you can then use to login - if you don't know you password click on Forgotten password? You'll be sent an email to reset the password.
If you do not have access to that email address and cannot remember the password DO NOT create a new FAN. Instead contact the My Account team for help (select PFF - My Account as the group)