At the bottom, click on “Manage Account“, look at the very bottom you will see the menu “Deactivate your Account”.
click on the “Deactivate your account” link:
This will open a pop up box asking for your password: Enter and click on the Confirm button.
Finally, you will be asked to read a captcha text and enter it. Do so and click on the Submit button.
Note: To complete the deactivation you will have to choose your reason for leaving from a list of options and then click on the Confirm button.
This will lead you to Facebook’s home page, where you will see a message confirming that your account has been deactivated.
Deactivation allows users to make their whole account invisible for temporary reasons and to recover all their information when they return, including their “list of friends” and their photos, just as it was before they left. To recover all their stuff they just have to log in again after 24 hours have passed since the deactivation.