How to delete Facebook account through the Facebook application on a smartphone
1. Log into the Facebook application.
2. Enter your email address / phone number and password to log into the account you want to delete. Then tap on “Log In” to log in.
3. Tap on the menu at the bottom right of the Facebook page.
4. Tap on “Settings & Privacy”.
5. Tap on “Settings”
6. Under “Your Facebook Information”, select “Account Ownership and Control”.
7. Tap on “Deactivation and Deletion”.
8. Select “Delete Account” then tap on “Continue to Account Deletion”.
9. Tap on “Continue to Account Deletion”.
10. Tap on “Delete Account”.
11. Enter your password and press “Continue”.
12. Tap “Delete Account” to confirm account deletion is complete.