I need to delete the homestead credit and the school credit. I misunderstood those particular questions and this app won’t let me go back to undo that information.

You can either delete the form all together or review the section to edit the questions that trigger the form. If you live in Wisconsin, the Homestead Credit is located on the State Schedule H, you can locate this specific form and remove it. 

To delete a Form from your return, please follow the instructions on the links below

How to Delete a Form on TurboTax Online

How to Delete a Form on TurboTax Desktop

** If you are using the app and are having a hard time with either of these steps, you might want to either switch to a computer or switch to a web browser within your phone, and sign into your TurboTax account through the web instead of the app.