1) Click on Federal Taxes in the navigation header
2) Click on Income and Expenses in the secondary header
3) Follow the prompts until you get to a summary which says "Your income and expenses"; in there you should see SELF-EMPLOYMENT INCOME/EXPENSES and under that "1099-MISC, write-offs, Schedule C, etc."
4) If you haven't already done so, you'll be prompted to answer lots of questions about your self-employed work. What you're looking for is a screen that says "Here is your ____ info" and there it has info about your work, your income and your expenses.
5) Click "Add expenses for this work". Then click "Add imported expenses". This will bring you back to where you can add expenses from your bank account to TurboTax.