I was sent to the US site to complete a form. It didnt list Canadian provinces and wouldnt let me enter my postal code
If you can't get into your account using the "I forgot my user ID or password" link on the sign in screen, then you can fill out an Account Recovery Request: https://turbotax.community.intuit.ca/questions/1717637-account-recovery-request
The web address for TurboTax Canada Online 2018 is: https://ww1.2018.turbotaxonline.intuit.ca/