Changing your email is usually not a big offer, but when it comes to Facebook, it's a bit more complex because your email address is also your Facebook login mail ID. You can change your login mail ID on Facebook by navigating to the Facebook settings page and verifying your new email address.
Facebook Email Changed
1. Browse to Facebook.com and log in to your Facebook account
2. Click the "Account" button on top right corner of the screen. Click "Account Settings."
3. Scroll down to your e-mail address and click the "Edit" icon.
4. Click "Include another email."
5. Enter your new e-mail address into the "Email" field and click "Save Modifications."
6. Input your Facebook password when triggered to validate the modifications.
7. Visit to your e-mail account and open the verification message from Facebook. Click the "Confirm" button within the message.
8. Click "Account," then "Account Settings." Click "Edit" beside "Email." Click the "Get rid of" button for your old email address to complete the process of altering your login mail ID on Facebook.
And one more thing please don’t forget to share this awesome trick to use the Facebook Email Changed with your friends.