Do you want to install the Desktop program or use the Online web version? There are 2 ways to use Turbo Tax. You can use the Desktop program installed on your computer and prepare your return Off Line. Or log into the Online web browser version which you can access from any computer or mobile device. The Desktop program and Online versions have different features and are priced differently.
You can Sign in or start a new Online account here,
https://turbotax.intuit.com/personal-taxes/online
The Desktop program can do unlimited returns and efile 5 federal for free. You can buy the Desktop CD or the Download program here,
https://turbotax.intuit.com/personal-taxes/cd-download