It's very embarrassing - I've spent over 3 hours this morning trying to work this through...
and I feel further embarrassed admitting this but I'm still trying to purchase an iBook but my apple ID keeps coming up as an email address that doesn't even have an Apple account. It's the original email address linked to the iPad but I want to use a different email address for my my Apple account - which I have set up.
I can't seem to change this even though I did use your advice through settings - Store. I get so for then I keep getting the message that I can't connect to iTunes store. This is so frustrating - I'm sure there's a simple solution but I cannot figure it out... 😟