To change the email address on Facebook, follow these steps:

1. Log in to your Facebook account.
2. Click on your profile icon at the top right corner.
3. Go to "Settings & Privacy" and then select "Settings."
4. In the settings menu, select "Personal Information" or "Your Facebook Information."
5. Find the "Contact Information" section and click the pencil icon or "Edit" next to your email address.
6. Click "Add another email address" and enter the new email.
7. Confirm with your Facebook password if prompted.
8. Check your new email inbox for a confirmation email from Facebook and verify it by clicking the link.
9. Once confirmed, make the new email your primary contact.
10. Optionally, remove the old email address.

This process can be done on both desktop and mobile apps with similar steps, ensuring your email address is updated and secure for your Facebook account.