email change

I have bought my product via my previous email rehoogenboom@upcmail.nl.
I have to change this into rehoogenboom@icloud.com. How can I achieve this at Epubor?
Thanks!

changed password at b&n ..epubor does not have input screen for new info..I think its using old info ..

Please help me I need to change the email address I have register with you. thank you