The "Get Started" button in your Welcome email will not log you into Thrive every time you click on it. It's purpose is to have you create a password and activate your account!
Once your account is activated, goto https://alberta.thrivemycareer.com/ and login with your email and password. We recommend bookmarking the URL for easy access.
Tip: Unsure if you're using the correct URL? Look for the mountains on the login page!