If you have received a 1099-K showing the Gross Amount you received for your driving, please enter that number for your income in "Your [ride sharing] Business" under "Business Income" and then the option "General Income."
The Fees that were deducted by your ride sharing company (Uber/Lyft) before giving you your money are a deduction. Please enter them under "Business Expenses" and "Other Common Businesss Expenses." You may choose to enter it under "Commissions" or as an "Other Miscellaneous Expense."