CPP exemption on self employed earnings

Over 65 and self employed.  Discovered doing my taxes Turbotax automatically calculates the employer and employee CPP and adds the combined to the total tax liability.    Do not want to pay CPP and on CRA Schedule 8 can file a election over 65 to stop contributing to the Canada Pension Plan on my self-employment earnings.    I see no place in completing Turbotax to show this election.   Can someone please tell me if this option is available and if so how to set it up.   Thank you.