I accidently added farm income and wasn't supposed to, how do I remove this from my return?

Schedule F is used to report Profit or Loss From Farming.

To remove Schedule F:

In TurboTax Desktop:

1. Open or continue your return.
2. Switch to Forms Mode by selecting the Forms icon.
3. From the menu, select the form you want to remove.
4. After the form is generated in the right pane, select the Delete Form button.

In TurboTax online:

1. Open or continue your return.
2. On Tax Home, select Start, Continue, or Pick up where you left off to enter your return.
3. In the left menu, select Tax Tools and then Tools.
4. In the pop-up window Tool Center, choose Delete a form.
5. Select Delete  schedule