How do I get rid of the charges for the TurboTax Assist & Review as I did not use this function? I am at the payment info screen.

need to file taxes that I did myse4lf  with my own purchase

Unfortunately, once you have upgraded or added features to your TurboTax return, there is no way to downgrade or remove the extra features. You would need to create a new return to go back to the original product. 

Thank you for choosing TurboTax.