When registering my new AC2350 I entered an incorrect email address- missed a letter

It's been a long day and while registering my new router I left off a letter on what seems to be one of the very few systems that doesn't ask me to re-enter the email address-  arg!  I tried to change it through the system, but all I could do is add in the correct email.  It won't let me delete the incorrect or even register the device to the proper email because it says it was already registered.  Any help would be appreciated.  Thanks