Follow these steps..
- Open your Facebook.
- Go to Settings from upper right hand drop down menu.
- Then select Security, last option will be Deactivate your account.
Facebook password confirmation page will come before going ahead.
- Finally, give an appropriate reason that why you're deactivating your account then simply press Deactivate button.
Note: Remember that, You will not be eligible to retrieve those changes, which you made. Then your all pages and application associated with this account will be deleted automatically. Your account will be deactivate with in 15 days unless you log in with in duration to re-activate this account.
Hopefully, this will help you.