To change the email address associated with your login profile, go to http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/pubLogin.jsp and login. Then on the Account Profile screen, enter the new email address and click 'Update My Contact Info.' You will need to verify the validity of the new email address by clicking the link of a web address (URL) contained in the confirmation email which will be sent to this new email address.
Toshiba Sat. C75D-B7260 Win 8.1 64 Bit--Toshiba Sat. L775D-S7132 Win 10 Home RTM Upgrade from W7 and Win 10 PRO Insider Preview--Toshiba Sat. L305-S5921 Win Vista SP2 32 Bit--Toshiba Sat. Radius P25W-C2300-4K Win 10 Home 64 Bit