If you are using TurboTax, only the desktop version offers Forms and Schedules
Other wise see here
https://www.irs.gov/e-file-providers/free-file-fillable-forms
You do not have direct access to the forms with online TurboTax. Forms mode is a feature of only the desktop software. All of your information must be entered via the interview screens.
If you have a simple return and want to file for free you can fill out the forms by hand. Here are some basic forms.....
Get blank IRS forms here
Forms & Instructions | Internal Revenue Service
Or Forms, Instructions and Publications | Internal Revenue Service
Current year 1040
https://www.irs.gov/pub/irs-pdf/f1040.pdf
Instructions
https://www.irs.gov/pub/irs-pdf/i1040gi.pdf
Schedules 1-3
https://www.irs.gov/pub/irs-pdf/f1040s1.pdf
https://www.irs.gov/pub/irs-pdf/f1040s2.pdf
https://www.irs.gov/pub/irs-pdf/f1040s3.pdf
Current year EIC and Tax Tables