If you imported your information from CRA and it shows you are "Self-Employed" from a T4A slip with an amount in Box 20 or Box 48, or a T4 slip with box 81,82 or 83, you need to leave this information on your tax return.
What you need to do is navigate to the Self Employment Summary of TurboTax and choose to EDIT the T2125 that has the imported information on it. Here you can complete the basic information, (use your own name and address), and add any expenses you may have to offset this business income.