I can't change my email.

I saw that a lot of people make a seperate email just for Blizzard, and I decided to do that. I will not share this email with anyone, or do anything on it other than WoW-related things. I went to my Battle.net account, and inserted the new email to change it, answered my secret question correctly and entered my correct password, the email is the same in both bars, the enter and the re-enter, but when I hit submit, a red arrow appears, pointing at the 'enter' bar, but it doesn't tell me what I did wrong. I checked the inbox of my new email, there's nothing there. What's going on here? It's very frustrating, and I want it to work in order to make my account as secure as possible.