Altering your email is normally not a huge offer, however when it comes to Facebook, it's a bit more complicated due to the fact that your e-mail address is also your Facebook login mail ID. You can change your login mail ID on Facebook by browsing to the Facebook settings page and verifying your brand-new email address.
Change Facebook Sign In Email
1. Search 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 email address and click the "Edit" icon.
4. Click "Include another email."
5. Enter your new email address into the "Email" field and click "Conserve Modifications."
6. Input your Facebook password when triggered to validate the modifications.
7. Log in to your e-mail account and open the confirmation message from Facebook. Click the "Verify" button within the message.
8. Click "Account," then "Account Settings." Click "Edit" beside "Email." Click the "Eliminate" button for your old e-mail 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 Change Facebook Sign In Email with your friends.