I am trying to set up Family Share on my iMac. I have entered the iCloud account that I want to use as organizer and when I go to the next step to enter the iTunes Apple ID that I want to use for iTunes purchases it says that my Apple ID must be an email address. This apple id I use for all my devices and it is only letters, not an email address. How do I get around this?
iMac with Retina 5K display, iOS 8.3, Family Share