To link a user account to Facebook follow the instruction:Open profile by the pressing on "Profile" buttons.Press the "Edit" button.Select the "Link to another account" and press "OK".Choose the selection and press on it. After the confirmation ends finish the linking by pressing "Done".WARNING! Account linking via Twitter will not work anymore.Related ArticlesHow To Change the Email of a User Account on Android?HOW TO CHANGE MY PROFILE PICTURE?HOW TO CHANGE THE USER PASSWORD?HOW TO CHANGE THE USER PROFILE NAME?How to Link Your User Account to Facebook or Apple ID?