My recommendation upgrade to xcode 5
as of tomorrow (1st of February 2014) all apps built and submitted to the app store must be done using at least xcode 5
this was announced by Apple on December 17, 2013 here https://developer.apple.com/news/?id=12172013a
Starting February 1, new apps and app updates submitted to the App Store must be built with the latest version of Xcode 5 and must be optimized for iOS 7.
Once you have upgrade all you need to do is Open the xcode 5 IDE
>> Preferences...
>> Accounts
tab >> On the left hand side you will see Apple IDs
and a +
at the bottom select the +
>> Add Apple ID...
>> enter your Apple ID
and Password
click Add
. The account should know be added.