Changing your e-mail is typically not a big deal, however when it concerns Facebook, it's a bit more complex because your e-mail address is also your Facebook login mail ID. You can alter your login mail ID on Facebook by navigating to the Facebook settings page and confirming your new e-mail address.
How To Change Primary Email Facebook
1. Browse to Facebook.com and log in to your Facebook account
2. Click the "Account" button at the leading right corner of the screen. Click "Account Settings."
3. Scroll down to your email address and click the "Edit" icon.
4. Click "Include another e-mail."
5. Enter your new email address into the "Email" field and click "Conserve Changes."
6. Input your Facebook password when prompted to verify the changes.
7. Log in to your email account and open the verification message from Facebook. Click the "Validate" button within the message.
8. Click "Account," then "Account Settings." Click "Edit" next to "Email." Click the "Get rid of" button for your old e-mail address to finish 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 How To Change Primary Email Facebook with your friends.