Facebook user name is incorrect
I bought a new i pad and restored the retina ipad from a backup. Since then the facebook app says password is incorrect for x email. Well that email is incorrect. I can log in on the app without the alert box being in my way wanting to take me to settings. In settings. There is no place to change username. Only a password area and a delete account button, which apparently do nothing. So what do i do next?
iPad 2 Wi-Fi, iOS 7.0.4