When you try to enter something the Free version doesn't allow it will prompt you to upgrade at that time.
OR
Go back to TurboTax and select the blue Take me to my return button.
After the blue Simple and accurate screen loads, select Upgrade on the left (if you don't see this, click or tap the 3 lines in the upper-left corner to open the menu).
You have clicked a link to a site outside of the TurboTax Community. By clicking "Continue", you will leave the Community and be taken to that site instead.