*How to recover lost Facebook account...* 

If the password has changed:

The most common type of hacking is done by changing the password of the account so that the original user cannot access it. As a matter of fact, recovering such account is relatively easier. You need to follow these steps for doing so.

If only the password has changed and you still have access to the associated email of the account then you may go to the “forgot password” option at the facebook login page.

Facebook will lead you to another page and will ask you to enter either your username, email address or the phone number. You can select any of the options.

Facebook will find your profile, view your specific profile enter either the email address or mobile number and click on “continue”.

A recovery code will be sent to your desired recovery option. Enter that code and click continue.

Now set your new password and your account will be ready to use again.