Hello, I need to change my last name (which has been legally changed) and my T4’s now have my NEW last name. How do I change my TurboTax account?

To change the name on your account, login, open a return and then select "Account Settings" from the bottom of the black left side menu. This will open another page for the Intuit Account Manager. There select "Personal Info", then click on "Name" and you will be able to change your first and last name.