To sign in to either account type, you can simply click on the Sign In button at the top-right of the TaxACT website.
You will then see the sign in screen with two tabs; Online Users and Download/CD Users:
Trouble with Username and Password? Chat with a live agent now.
Providing your e-mail address may speed up recovery of your information.
Questions not related to username and password? Contact TaxACT Service & Support