Your primary Facebook email address is the address you use
when you log in to your Facebook account.
Additional email addresses can be listed on your profile as
well if you chose.
Changing, adding or deleting email addresses on your
Facebook account is easy to do.
Log in to your Facebook account.
Select the "Account" menu in the upper right
corner of the screen and select "Account Settings" from the drop-down
menu.
Click on "General" from the list in the left
panel of the Account Settings page.
Click on "Email" in the main window to expand the
section.
Click "Remove" next to any email address to
delete it.
Click "Add another email" and type a new address
into the space provided.
Click the radio button next to any email address to
designate it as the primary Facebook email address.
Click "Save Changes."
Facebook sends a confirming email.
The change does not take place until you open the email and
confirm the change.
http://www.facebook.com/help/?faq=162801153783275&ref_query=email+ad
How do I add or remove an
email address from my account
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