When you registered for the site, you chose a user handle to be associated with your email address. Twokathleens is currently associated with your email address. If you’d like a different handle, you will have to register for the site again with a new email address. If you would like to use the same email address, change the address associated with “Twokathleens” to free up your email address for the new handle.
I apologize for the inconvenience.