You can change your user details from theĀ Customer Center.

If you have changed e-mail address or are unsure of your latest license key or are unable to unlock a program you can always log in to the Customer Center to see your current license key. It should always be up-to-date from there. Please remember to set a password in the Customer Center if you have not already done this. This will let you log in even if you have lost your license key.