First, go to the ?Update Info? button on you profile. From there, scroll down to contact information and click ?edit.? All you have to do at this point is change the Facebook email address to ?Hidden from Timeline? and then change the primary email address to ?Show on Timeline? and voila
It's simple: 1. click the down arrow beside "home" 2. click account settings 3. click the "edit" at the right side of email 4. click "another email" 5. type in your new email address, don't forget to type your password below. 6. then click save.