When you create a Facebook account, you can enter a contact email address to receive notifications. If you no longer use the email address you entered when you created your account, you can change it for another one at any time.
Changing your Facebook email is simple and you can do it from your computer or your mobile device.
How To Change Email Connected to Facebook
Sign in to Facebook, click the triangle at the top right and select Settings. Under General Account Settings, click Contact > Add another email address or mobile number:
Enter your new email address in the New Email field, and click Add:
Select it as your main address and click Save Changes.
N.B. You will receive a confirmation email at the new address you have added. Please note that you will not be able to log in to Facebook with your new address until you open the email that has been sent to you and confirm the change.
If you have more than one email address associated with your account, the notifications will be received at the one you have chosen as the primary address on the General Account Settingspage.