You can't delete a form in the mobile app. You can go to a web browser on your mobile device and sign into https://turbotax.intuit.com/ to delete a form or go to https://turbotax.intuit.com/ on a computer or laptop.
Please refer to the following TurboTax FAQ on how to delete Form 2441 in TurboTax Online if you start the Child and Dependent Care section but don't complete it:
https://ttlc.intuit.com/replies/4233631