To know how to change Facebook email from the web, tap on the down arrow and then to settings and privacy. From there, navigate to settings > edit and then input the new email. And, if you want to change from an application, then start by going to the menu and then settings and privacy and after that, settings. From settings, move ahead to personal info > contact info > add email address here you can input the new email. Give your confirmation via email if updating through the website. And if updating on the app, confirm through text.