TurboTax Online and Desktop versions allow you to enter much of your tax data yourself manually.
The desktop version has "Forms" mode that allows you to see/edit the actual tax forms as you enter your information (however, be aware that inputting data directly on a form - instead of entering info during the program's interview process - may void your 100% Accuracy Guarantee.).
If you are using a desktop version, click the Form icon in the upper right side of the screen.
The online versions of TurboTax do not support Forms Mode.