I wanted to create an account for ubuntu one, but I got impatient when the email with the verification code didn't arrive.... so I thought I might have typed the wrong andress, closed the window and tried again. it told me the adress already existed and i just got the code. but well the i closed the window and I wonder if there is a way to re-open the window?
You should be able to log in on https://login.ubuntu.com/ using the username/password you used to create the account, and enter the verification code somewhere on that site.
If you are unable to do so, you should contact https://one.ubuntu.com/help/contact/ for support.