If you are in the Desktop/Download version of TurboTax, you may need to revise that in the Interview mode if the Forms mode is not allowing.
Also, if the number is blue in Forms mode, it was entered and if it is black, it is calculated, so you generally have to revise entries where they are blue.
Go to the Business section and Update Other Common Business Expenses
Scroll down to Legal and Professional Fees and click on Update.