change facebook username in settings
I have changed my facebook emai address on a computer as my login and deleted the old email address as it does not exist anymore. However, my iphone in the IOS settings is stuck on trying to log me in under the old username which does not exist anymore and in the settings scroll down to facebook, there is only an option to enter a password no username...how do I change the unsername so that IOS logs in correctly...
I keeps prompting me to login and it shows the old username..
iPhone 4 (8GB), iOS 7.0.2