I need help filing my return.

Somewhere on my return I elected to not pay CPP on self-emplyed earnings, but now the system won't let me efile. I want to delete that election, but I can't find where I entered that. Can you tell me where I entered that so I can go back and delete it so I can efile my return today? Thank you

Filing

Go to Income- Employment Status -> You will check off the box -> 

I want to make optional CPP or QPP contributions - then continue and you will find the next page which you can opt to pay more or not to pay that extra CPP.