If you want to change the email address associated to your account, it's very simple.
- Log into your current profile here
- Click on "My information" on the left panel
- Remove the email address
- Type the new email address you want to associate your web account with
- If you want to change the password, click on "Change Password" and complete the fields below with the new password and its confirmation.
- Click on "Save"
Once these steps are done, you will be able to use the new email address and the associated password to log into your profil.
All prior information such as products, their serial number, your address etc.. will be kept into the new account.