If you use TurboTax Online the "take me to my return" button appears right after you log in (see picture).
If you are using TurboTax Download/CD then there won't be a "take me to my return" button please follow these steps:
If you have already filed, you have to amend your return in order to change it.
Wait until you’ve either received your refund or the IRS has taken payment out of your account. (The IRS will only accept a 1040X, or amended return if your original 1040 was accepted.)
To look at a return you have already filed:
For further information please see the TurboTax website: How do I amend my 2019 return?