Facebook has many hidden features. Here I just try to share those hidden features of Facebook. Today i am going to show you how you can add another email address to Facebook. Or how do you change which email address Facebook notifications are send to you. You can add another email address to your Facebook account and you can use it for log into Facebook. If you have to change your email address in Facebook account then just follow the below mentioned steps. 
Also Read: Facebook Ends Its @facebook.com Email Address Service
1. Log in to Your Facebook account then Click 
at the top right of Facebook and select Settings.
2. By clicking on settings new general account settings page will appear on your screen.On this page click on Email.
Also Red: How to change Facebook password
3.After clicking on email option you have to click on Add another email 
then new pop up will appear on your screen in which you have to type your new email address and hit Add button.
4. After that Facebook will ask you to re-enter your Facebook password to continue process.
So enter your password and click on Submit button, after that Facebook will send you confirmation mail on your newly added email.
5. Go to inbox of respective email which you added on your Facebook account and you will get there Facebook Email Verification mail from Facebook,
open it and follow the instructions which are mentioned in that mail and that’s it. You successfully changed your email address on Facebook.Once you confirmed your new email address for facebook then you can use it for Facebook log in.
See More : How to change your name on Facebook
Note: You can add multiple email address to your Facebook account but If you have more than one email address linked to your Facebook account then Facebook will send your daily notifications to the your primary email address which you choose on your Facebook General Account Settings page.